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equivalents Cash and Cash Equivalents, at Carrying Value Timing of revenue recognition Revenue, Performance Obligation, Description of Timing Interest paid during the period Interest Paid, Excluding Capitalized Interest, Operating Activities Credit Facility [Domain] Credit Facility [Domain] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Line of credit facility, additional borrowing capacity Line Of Credit Facility, Accordion Feature, Increase (Decrease) To Borrowing Capacity Line Of Credit Facility, Accordion Feature, Increase (Decrease) To Borrowing Capacity Long-term debt Long-Term Debt, Excluding Current Maturities Corporate accounts Sales Channel, Through Corporate Accounts Network [Member] Sales Channel, Through Corporate Accounts Network [Member] Diluted weighted average number of shares outstanding (in shares) Diluted weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Freight costs Freight Costs, Current Freight Costs, Current Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Identified intangible assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Schedule of Amount of Transaction Price From Contracts With Customers Allocated To The Company's Contract Liabilities Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Derecognitions for divestitures Goodwill, Written off Related to Sale of Business Unit Revenue Recognition Revenue from Contract with Customer [Text Block] Purchases of property, plant, and equipment Payments to Acquire Property, Plant, and Equipment Company Selected Measure Amount Company Selected Measure Amount Paid-in capital Additional Paid in Capital, Common Stock Revolving Credit Facility The Revolving Credit Facility [Member] The Revolving Credit Facility [Member] Paid-in Capital Additional Paid-in Capital [Member] Total assets Assets Name Awards Close in Time to MNPI Disclosures, Individual Name Loss Contingencies [Line Items] Loss Contingencies [Line Items] Cover [Abstract] Cover [Abstract] Total assets at fair value Asset Fair Value Disclosure, Including Equity Securities Without Readily Determinable Fair Value, Amount Asset Fair Value Disclosure, Including Equity Securities Without Readily Determinable Fair Value, Amount Fair value measured on recurring basis Fair Value, Recurring [Member] Number of acquisitions Number of Businesses Acquired Restructuring and Related Activities [Abstract] Restructuring and Related Activities [Abstract] Other Current Liabilities Other Liabilities Disclosure [Text Block] Other long-term liabilities Other Liabilities, Noncurrent Non-NEOs Non-NEOs [Member] Other comprehensive (loss) income, before tax Other Comprehensive Income (Loss), before Tax, Portion Attributable to Parent Retail sales Sales Channel, Through Retail [Member] Sales Channel, Through Retail [Member] Pension Plan Pension Plan [Member] Segment Information Segment Reporting Disclosure [Text Block] Net change in cash and cash equivalents Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Non-PEO NEO Non-PEO NEO [Member] Equity Component [Domain] Equity Component [Domain] Adjustment to Compensation: Adjustment to Compensation [Axis] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Debt Instrument [Line Items] Debt Instrument [Line Items] Basic weighted average number of shares outstanding (in shares) Basic weighted average shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Entity Current Reporting Status Entity Current Reporting Status Operating profit Operating profit: Operating profit Operating Income (Loss) Reclassifications Reclassification, Comparability Adjustment [Policy Text Block] Sunoptics Prismatic Skylights Business Sunoptics Business [Member] Sunoptics Business Comprehensive income: Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Proceeds from stock option exercises and other Proceeds, Issuance of Shares, Share-Based Payment Arrangement, Including Option Exercised Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Segments [Axis] Segments [Axis] Estimate of Fair Value Measurement Estimate of Fair Value Measurement [Member] Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Contract with Customer, Sales Channel [Domain] Contract with Customer, Sales Channel [Domain] Type of Restructuring [Domain] Type of Restructuring [Domain]