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Revenue Recognition (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2019 USD ($) day	Jun. 30, 2018 USD ($)	Jun. 29, 2019 USD ($) day	Jun. 30, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Standard terms of payment, number of days | day	10		10
Net sales	$ 706,448	$ 892,952	$ 1,345,149	$ 1,330,439
Warehouse
Disaggregation of Revenue [Line Items]
Net sales	577,000	704,328	1,081,274	1,037,634
Direct
Disaggregation of Revenue [Line Items]
Net sales	122,262	165,630	245,667	248,573
Reload and service revenue
Disaggregation of Revenue [Line Items]
Net sales	16,617	34,914	35,522	63,184
Customer discounts and rebates
Disaggregation of Revenue [Line Items]
Net sales	(9,431)	(11,920)	(17,314)	(18,952)
Structural products
Disaggregation of Revenue [Line Items]
Net sales	225,056	345,878	422,551	522,359
Specialty products and other
Disaggregation of Revenue [Line Items]
Net sales	$ 481,392	$ 547,074	$ 922,598	$ 808,080

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

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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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