Other Liabilities Disclosure [Abstract] Other Non-Current Liabilities Other Liabilities Disclosure [Text Block] Deferred benefit from New Market Tax Credit transactions Deferred benefit from New Markets Tax Credit Deferred benefit from New Markets Tax Credit Retirement plan obligations Pension and Other Postretirement Defined Benefit Plans, Liabilities, Noncurrent Deferred compensation plan Deferred Compensation Liability, Classified, Noncurrent Other Other Accrued Liabilities, Noncurrent Total other non-current liabilities Other Liabilities, Noncurrent Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Nonvested share award transactions Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Nonvested Number, Beginning Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Number of shares, Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Number of shares, Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Nonvested Number, Ending Nonvested share award transactions, Weighted Average Grant Date Fair Value [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract] Weighted average grant date fair value, Beginning Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted average grant date fair value, Granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value, Vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value Weighted average grant date fair value, Ending Earnings Per Share [Abstract] Reconciliation of basic and diluted earnings per share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Business Combinations [Abstract] Net sales Business Acquisition, Pro Forma Revenue Net earnings Business Acquisition, Pro Forma Net Income (Loss) Earnings per share Business Acquisition, Pro Forma Information [Abstract] Basic (USD per share) Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Basic Diluted (USD per share) Business Acquisition, Pro Forma Income (Loss) from Continuing Operations, Net of Tax, Per Share, Diluted Schedule of Recognized Identified Assets Acquired Schedule of Recognized Identified Assets Acquired and Liabilities Assumed [Table Text Block] Business Acquisition, Pro Forma Information Business Acquisition, Pro Forma Information [Table Text Block] Award transactions on stock options Schedule of Share-based Compensation, Stock Options and Stock Appreciation Rights Award Activity [Table Text Block] Nonvested share award transactions Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Sotawall Sotawall [Member] Sotawall [Member] Business Acquisition [Line Items] Business Acquisition [Line Items] Net working capital Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Working Capital Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Goodwill Goodwill Other intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Net assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Document and Entity Information [Abstract] Abstract for Document and Entity Information Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Document Type Document Type Document Period End Date Document Period End Date Amendment Flag Amendment Flag Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Statement of Cash Flows [Abstract] Operating Activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net earnings Net Income (Loss) Attributable to Parent Adjustments to reconcile net earnings to net cash provided by (used in) operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation and amortization Depreciation, Depletion and Amortization Stock-based compensation Share-based Compensation Deferred income taxes Deferred Income Tax Expense (Benefit) Other, net Other Noncash Income (Expense) Changes in operating assets and liabilities: Increase (Decrease) in Operating Capital [Abstract] Receivables Increase (Decrease) in Receivables Inventories Increase (Decrease) in Inventories Accounts payable and accrued expenses Increase (Decrease) in Accounts Payable and Accrued Liabilities Billings in excess of costs and earnings on uncompleted contracts Increase (Decrease) in Billing in Excess of Cost of Earnings Refundable and accrued income taxes Increase (Decrease) in Income Taxes Payable, Net of Income Taxes Receivable Other, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash provided by (used in) operating activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations Investing Activities Net Cash Provided by (Used in) Investing Activities [Abstract] Capital expenditures Payments to Acquire Property, Plant, and Equipment Change in restricted cash Increase (Decrease) in Restricted Cash Purchases of marketable securities Payments to Acquire Available-for-sale Securities, Debt Sales/maturities of marketable securities Proceeds from Sale of Available-for-sale Securities, Debt Other, net Payments for (Proceeds from) Other Investing Activities Net cash provided by (used in) investing activities Net Cash Provided by (Used in) Investing Activities Financing Activities Net Cash Provided by (Used in) Financing Activities [Abstract] Borrowings on line of credit Proceeds from (Repayments of) Lines of Credit Payments on line of credit Repayments of Long-term Debt Shares withheld for taxes, net of stock issued to employees Shares Withheld For Taxes Net Of Stock Issued To Employees The cash outflow paid by the company to cover an employee's income tax withholding obligation as part of a net-share settlement of a share-based award, net of the total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. Dividends paid Payments of Ordinary Dividends, Common Stock Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Decrease in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease), Excluding Exchange Rate Effect Effect of exchange rates on cash Effect of Exchange Rate on Cash and Cash Equivalents Cash and cash equivalents at beginning of year Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Noncash Activity Noncash Investing and Financing Items [Abstract] Capital expenditures in accounts payable Capital Expenditures Incurred but Not yet Paid Acquisition Business Combination Disclosure [Text Block] Organization, Consolidation and Presentation of Financial Statements [Abstract] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent event Subsequent Event [Member] EFCO Corporation EFCO Corporation [Member] EFCO Corporation [Member] Percentage of voting interests acquired Business Acquisition, Percentage of Voting Interests Acquired Debt payment to acquire business Debt payment to acquire business Debt payment to acquire business Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Statement Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] Architectural Glass Architectural [Member] Architectural. Architectural Services Architectural Services segment [Member] Architectural Services segment [Member] Architectural Framing Systems Architectural Framing Segment [Member] Architectural Framing Segment [Member] Large-Scale Optical Large Scale Optical [Member] Large scale optical. Intersegment eliminations Intersegment Eliminations [Member] Corporate and other Corporate and Other [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Sales and operating income data Segment Reporting Information, Profit (Loss) [Abstract] Net sales Revenue, Net Operating income (loss) Operating Income (Loss) Number of Reportable Segments Number of Reportable Segments Number of Operating Segments Number of Operating Segments Fair Value Disclosures [Abstract] Financial assets and liabilities measured at fair value Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Statement of Financial Position [Abstract] Assets Assets [Abstract] Current assets Assets, Current [Abstract] Cash and cash equivalents Short-term available for sale securities Available-for-sale Securities, Debt Securities, Current Restricted cash Restricted Cash and Cash Equivalents, Current Receivables, net of allowance for doubtful accounts Accounts Receivable, Net, Current Inventories Inventory, Net Refundable income taxes Income Taxes Receivable, Current Other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Property, plant and equipment, net Property, Plant and Equipment, Net Available for sale securities Available-for-sale Securities, Debt Securities, Noncurrent Deferred tax assets Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Goodwill Intangible assets Intangible Assets, Net (Excluding Goodwill) Other assets Other Assets, Noncurrent Total assets Assets Liabilities and Shareholders' Equity Liabilities and Equity [Abstract] Current liabilities Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Accrued payroll and related benefits Employee-related Liabilities, Current Accrued self-insurance reserves Self Insurance Reserve, Current Other current liabilities Other Liabilities, Current Billings in excess of costs and earnings on uncompleted contracts Billings in Excess of Cost Accrued income taxes Accrued Income Taxes, Current Total current liabilities Liabilities, Current Long-term debt Long-term Debt, Excluding Current Maturities Unrecognized tax benefits Liability for Uncertainty in Income Taxes, Noncurrent Long-term self-insurance reserves Self Insurance Reserve, Noncurrent Deferred tax liabilities Deferred Tax Liabilities, Net, Noncurrent Other non-current liabilities Commitments and contingent liabilities (Note 13) Commitments and Contingencies Shareholders' equity Stockholders' Equity Attributable to Parent [Abstract] Common stock of $0.33-1/3 par value; authorized 50,000,000 shares; issued and outstanding 28,996,209 and 28,958,119, respectively Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Retained earnings Retained Earnings (Accumulated Deficit) Common stock held in trust Common Stock Issued, Employee Stock Trust Deferred compensation obligations Compensation and Benefits Trust Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total shareholders’ equity Stockholders' Equity Attributable to Parent Total liabilities and shareholders' equity Liabilities and Equity Debt Disclosure [Abstract] Debt Debt Disclosure [Text Block] Line of Credit Facility [Table] Line of Credit Facility [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Revolving credit facility Revolving Credit Facility [Member] Industrial Revenue Bonds Recovery Zone Facility Bonds [Member] Recovery zone facility bonds. Short-term Debt, Type [Axis] Short-term Debt, Type [Axis] Short-term Debt, Type [Domain] Short-term Debt, Type [Domain] Letter of credit Letter of Credit [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Debt Long-term Debt Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Outstanding borrowings Long-term Line of Credit Interest payments Interest Paid Goodwill and Intangible Assets Disclosure [Abstract] Schedule Of Goodwill [Table] Schedule of Goodwill [Table] Goodwill [Line Items] Goodwill [Line Items] Schedule of goodwill attributable to each business segment Goodwill [Roll Forward] Goodwill, Beginning Goodwill acquired Goodwill, Acquired During Period Goodwill adjustment for purchase accounting Goodwill, Purchase Accounting Adjustments Foreign currency translation Goodwill, Foreign Currency Translation Gain (Loss) Goodwill, Ending Statement of Comprehensive Income [Abstract] Tax expense (benefit) on marketable securities Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax Marketable Securities [Abstract] Marketable Securities Marketable Securities [Table Text Block] Schedule of estimated future amortization expense for identifiable intangible assets Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] Estimated amortization expense, Remainder of Fiscal 2018 Finite-Lived Intangible Assets, Amortization Expense, Remainder of Fiscal Year Estimated amortization expense, Fiscal 2019 Finite-Lived Intangible Assets, Amortization Expense, Year Two Estimated amortization expense, Fiscal 2020 Finite-Lived Intangible Assets, Amortization Expense, Year Three Estimated amortization expense, Fiscal 2021 Finite-Lived Intangible Assets, Amortization Expense, Year Four Estimated amortization expense, Fiscal 2022 Finite-Lived Intangible Assets, Amortization Expense, Year Five Compensation and Retirement Disclosure [Abstract] Employee Benefit Plans Pension and Other Postretirement Benefits Disclosure [Text Block] Inventory Disclosure [Abstract] Components of inventories Schedule of Inventory, Current [Table Text Block] Earnings Per Share Earnings Per Share [Text Block] Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Schedule of goodwill attributable to each business segment Schedule of Goodwill [Table Text Block] Schedule of finite lived intangible assets Schedule of Finite-Lived Intangible Assets [Table Text Block] Schedule of estimated future amortization expense for identifiable intangible assets Schedule of Finite-Lived Intangible Assets, Future Amortization Expense [Table Text Block] Other Non-current Liabilities Other Noncurrent Liabilities [Table Text Block] Income Statement [Abstract] Cost of sales Cost of Goods Sold Gross profit Gross Profit Selling, general and administrative expenses Selling, General and Administrative Expense Operating income Interest income Investment Income, Interest Interest expense Interest Expense Other income (expense), net Other Nonoperating Income (Expense) Earnings before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income tax expense (benefit) Income Tax Expense (Benefit) Net earnings Earnings per share - basic Earnings Per Share, Basic [Abstract] Net earnings Earnings Per Share, Basic Earnings per share - diluted Earnings Per Share, Diluted [Abstract] Net earnings Earnings Per Share, Diluted Weighted average basic shares outstanding Weighted Average Number of Shares Outstanding, Basic Weighted average diluted shares outstanding Weighted Average Number of Shares Outstanding, Diluted Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types Of Debt And Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] Money market funds Money Market Funds [Member] Commercial paper Commercial Paper [Member] Municipal bonds Municipal Bonds [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Quoted Prices in Active Markets (Level 1) Fair Value, Inputs, Level 1 [Member] Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Eligible Item or Group for Fair Value Option [Axis] Financial Instrument [Axis] Fair Value, Option, Eligible Item or Group [Domain] Financial Instruments [Domain] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Financial assets and liabilities measured at fair value Fair Value, Assets Measured on Recurring and Nonrecurring Basis, Alternative [Abstract] Cash equivalents Cash and Cash Equivalents [Abstract] Total cash equivalents Cash and Cash Equivalents, Fair Value Disclosure Available-for-sale Securities, Current Available-for-sale Securities, Current Available-for-sale Securities, Noncurrent Available-for-sale Securities, Noncurrent Total assets at fair value Assets, Fair Value Disclosure Amortized Cost Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] Due within one year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis Due after one year through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis Due after five years through 10 years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis Due after 10 years through 15 years Available-for-sale Securities, Debt Maturities, Year Eleven Through Year Fifteen, Amortized Cost Basis Available-for-sale Securities, Debt Maturities, Year Eleven Through Year Fifteen, Amortized Cost Basis Due beyond 15 years Available-for-sale Securities, Debt Maturities, After Fifteen Years, Amortized Cost Basis Available-for-sale Securities, Debt Maturities, After Fifteen Years, Amortized Cost Basis Total Available-for-sale Debt Securities, Amortized Cost Basis Estimated Fair Value Available-for-sale Securities, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Due within one year Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value Due after one year through five years Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value Due after five years through 10 years Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value Due after 10 years through 15 years Available-for-sale Securities, Debt Maturities, Year Eleven Through Year Fifteen, Fair Value Available-for-sale Securities, Debt Maturities, Year Eleven Through Year Fifteen, Fair Value Due beyond 15 years Available-for-sale Securities, Debt Maturities, After Fifteen Years, Fair Value Available-for-sale Securities, Debt Maturities, After Fifteen Years, Fair Value Total Available-for-sale Securities, Debt Securities Share-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Restricted Stock [Member] Restricted Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Cash proceeds from exercise of stock options Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options Aggregate intrinsic value of securities Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Total unrecognized compensation cost related to nonvested share Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options Weighted average period, Nonvested Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Total fair value of shares vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Commitments and Contingencies Disclosure [Abstract] Commitments and Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Segment Information Segment Reporting Disclosure [Text Block] Schedule Of Finite Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite Lived Intangible Assets By Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite Lived Intangible Assets Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Debt issue costs Debt Issue Costs [Member] Debt issue costs Non-compete agreements Noncompete Agreements [Member] Customer relationships Customer Relationships [Member] Trademarks and other intangibles Trademarks [Member] Finite Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Schedule of finite lived identifiable intangible assets Finite-Lived Intangible Assets, Net [Abstract] Gross Carrying Amount Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Foreign Currency Translation Finite Lived Identifiable Intangible Assets, Foreign Currency Translation Adjustment Finite lived identifiable intangible assets translation adjustments. Net Finite-Lived Intangible Assets, Net Indefinite-Lived Intangible Assets (Excluding Goodwill) Indefinite-Lived Intangible Assets (Excluding Goodwill) Indefinite Lived Identifiable Intangible Assets, Foreign Currency Translation Adjustments Indefinite Lived Identifiable Intangible Assets, Foreign Currency Translation Adjustments Indefinite Lived Identifiable Intangible Assets, Foreign Currency Translation Adjustments Indefinite-lived Intangible Assets (Excluding Goodwill), Net of translation adjustments Indefinite-lived Intangible Assets (Excluding Goodwill), Net of translation adjustments Indefinite-lived Intangible Assets (Excluding Goodwill), Net of translation adjustments Intangible Assets, Gross (Excluding Goodwill) Intangible Assets, Gross (Excluding Goodwill) Intangible Assets Accumulated Amortization Intangible Assets Accumulated Amortization Intangible Assets Accumulated Amortization Intangible Assets Foreign Currency Translation Intangible Assets Foreign Currency Translation Intangible Assets Foreign Currency Translation Intangible Assets, Net (Excluding Goodwill) Fair Value Measurements Fair Value Disclosures [Text Block] Net earnings Other comprehensive earnings: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Unrealized gain (loss) on marketable securities, net of $33 and ($9) of tax expense (benefit), respectively Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax, Portion Attributable to Parent Other comprehensive earnings (loss) Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Total comprehensive earnings Comprehensive Income (Loss), Net of Tax, Attributable to Parent Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Axis] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Domain] Equity-Based Arrangements, Individual Contracts, Type of Deferred Compensation [Domain] Deferred Compensation, Share-based Payments [Member] Deferred Compensation, Share-based Payments [Member] Award transactions on stock options Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] Outstanding, Beginning Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Outstanding shares awards exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Outstanding, Ending Award transactions on stock options, Weighted Average Exercise Price [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract] Weighted average exercise price, Beginning Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted average exercise price, Awards exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted average exercise price, Ending Weighted average remaining contractual life, Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Aggregate intrinsic value, Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Components of net periodic benefit cost Schedule of Net Benefit Costs [Table Text Block] Company's backlog bonded by performance bonds Companies Backlog Related to Sales Companies backlog related to sales. Face value of performance bonds Debt Instrument, Face Amount Purchase obligations Purchase Obligation Greater Than or Equal to 12 Months, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Future minimum rental payments under noncancelable operating leases Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] Guarantees and warranties Schedule of Product Warranty Liability [Table Text Block] Inventories Inventory Disclosure [Text Block] Future minimum rental payments under noncancelable operating leases Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] Total minimum payments, Remainder of Fiscal 2018 Operating Leases, Future Minimum Payments Due, Next Twelve Months Total minimum payments, Fiscal 2019 Operating Leases, Future Minimum Payments, Due in Two Years Total minimum payments, Fiscal 2020 Operating Leases, Future Minimum Payments, Due in Three Years Total minimum payments, Fiscal 2021 Operating Leases, Future Minimum Payments, Due in Four Years Total minimum payments, Fiscal 2022 Operating Leases, Future Minimum Payments, Due in Five Years Total minimum payments, Thereafter Operating Leases, Future Minimum Payments, Due Thereafter Total Operating Leases, Future Minimum Payments Due Income Tax Disclosure [Abstract] Liability for uncertain tax positions, current and noncurrent Liability for uncertain tax positions, current and noncurrent Liability for uncertain tax positions, current and noncurrent Liability for unrecognized tax benefit, expected decrease Significant Change in Unrecognized Tax Benefits is Reasonably Possible, Amount of Unrecorded Benefit Components of net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost [Abstract] Interest cost Defined Benefit Plan, Interest Cost Expected return on assets Defined Benefit Plan, Expected Return on Plan Assets Amortization of unrecognized net loss Defined Benefit Plan, Amortization of Gains (Losses) Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost Amortized cost, gross unrealized gains and losses, and estimated fair values of investments available for sale Schedule of Available-for-sale Securities Reconciliation [Table Text Block] Schedule of amortized cost and estimated fair values of investments by contractual maturity Investments Classified by Contractual Maturity Date [Table Text Block] Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common stock, shares issued Common Stock, Shares, Issued Common stock, shares outstanding Common Stock, Shares, Outstanding Goodwill and Other Identifiable Intangible Assets Goodwill and Intangible Assets Disclosure [Text Block] Guarantees and warranties Movement in Extended Product Warranty Accrual [Roll Forward] Balance at beginning of period Extended Product Warranty Accrual Additional accruals Extended Product Warranty Accrual, Increase for Warranties Issued Claims paid Extended Product Warranty Accrual, Decrease for Payments Balance at end of period Income Taxes Income Tax Disclosure [Text Block] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Major Types Of Debt And Equity Securities [Axis] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Amortized Cost Gross Unrealized Gains Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax Estimated Fair Value Reconciliation of basic and diluted earnings per share Earnings Per Share, Basic and Diluted [Abstract] Basic earnings per share - weighted common shares outstanding Incremental Common Shares Attributable to Share-based Payment Arrangements Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Weighted Average Number of Shares Outstanding, Diluted Stock options excluded from the calculation of earnings per share because the exercise price was greater than the average market price of the common shares Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Common Stock [Member] Common Stock [Member] Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Retained Earnings [Member] Retained Earnings [Member] Common Stock Held In Trust [Member] Common Stock Held In Trust [Member] Common stock held in trust. Deferred Compensation Obligation [Member] Deferred Compensation Obligation [Member] Deferred compensation obligation. Accumulated Other Comprehensive Income (Loss) [Member] AOCI Attributable to Parent [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Beginning balance (in shares) Shares, Outstanding Beginning balance Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Stock Issued During Period, Value, Share-based Compensation, Net of Forfeitures Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net Outstanding shares awards exercised Stock Issued During Period, Value, Stock Options Exercised Stock Issued During Period, Value, Stock Options Exercised Stock Repurchased and Retired During Period, Shares Stock Repurchased and Retired During Period, Shares Stock Repurchased and Retired During Period, Value Stock Repurchased and Retired During Period, Value Dividends, Common Stock, Cash Dividends, Common Stock, Cash Ending balance (in shares) Ending balance Sales and operating income data Schedule of Segment Reporting Information, by Segment [Table Text Block] Accounting Changes and Error Corrections [Abstract] New Accounting Standards New Accounting Pronouncements and Changes in Accounting Principles [Text Block] Components of inventories Inventory, Net, Items Net of Reserve Alternative [Abstract] Raw materials Inventory, Raw Materials, Net of Reserves Work-in-process Inventory, Work in Process, Net of Reserves Finished goods Inventory, Finished Goods, Net of Reserves Costs and earnings in excess of billings on uncompleted contracts Costs in Excess of Billings, Current Total inventories Goodwill and Other Identifiable Intangible Assets (Textual) [Abstract] Goodwill and Other Identifiable Intangible Assets (Textual) [Abstract] Goodwill and other identifiable intangible assets. Amortization expense on identifiable intangible assets Amortization of Intangible Assets