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Revenue Recognition (Details) $ in Thousands	3 Months Ended
	Mar. 28, 2020 USD ($) day	Mar. 30, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Standard terms of payment, number of days | day	10
Net sales	$ 662,070	$ 638,701
Warehouse and reload
Disaggregation of Revenue [Line Items]
Net sales	545,892	523,179
Direct
Disaggregation of Revenue [Line Items]
Net sales	125,582	123,404
Customer discounts and rebates
Disaggregation of Revenue [Line Items]
Net sales	(9,404)	(7,882)
Structural products
Disaggregation of Revenue [Line Items]
Net sales	240,778	196,786
Specialty products
Disaggregation of Revenue [Line Items]
Net sales	$ 421,292	$ 441,915

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Contract With Customer, Standard Terms Of Payment, Number Of Days

+ References

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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