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Revenue Recognition (Details) $ in Thousands	12 Months Ended
	Dec. 29, 2018 USD ($) day	Dec. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Disaggregation of Revenue [Line Items]
Standard terms of payment, number of days | day	10
Net sales	$ 2,862,850	$ 1,815,535	$ 1,881,043
Warehouse
Disaggregation of Revenue [Line Items]
Net sales	2,239,883	1,366,241
Direct
Disaggregation of Revenue [Line Items]
Net sales	526,900	354,278
Reload and service revenue
Disaggregation of Revenue [Line Items]
Net sales	134,045	125,108
Reload and service revenue
Disaggregation of Revenue [Line Items]
Net sales	(37,978)	(30,092)
Structural products
Disaggregation of Revenue [Line Items]
Net sales	1,286,119	841,862
Specialty products
Disaggregation of Revenue [Line Items]
Net sales	1,593,969	988,824
Other | Other
Disaggregation of Revenue [Line Items]
Net sales	$ (17,238)	$ (15,151)

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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.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 606
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