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Revenue Recognition (Details) $ in Thousands	3 Months Ended
	Mar. 30, 2019 USD ($) day	Mar. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Standard terms of payment, number of days | day	10
Net sales	$ 638,701	$ 437,487
Warehouse
Disaggregation of Revenue [Line Items]
Net sales	504,274	333,306
Direct
Disaggregation of Revenue [Line Items]
Net sales	123,404	82,942
Reload and service revenue
Disaggregation of Revenue [Line Items]
Net sales	18,905	28,270
Customer discounts and rebates
Disaggregation of Revenue [Line Items]
Net sales	(7,882)	(7,031)
Structural products
Disaggregation of Revenue [Line Items]
Net sales	197,492	176,481
Specialty products
Disaggregation of Revenue [Line Items]
Net sales	437,672	258,589
Other | Other
Disaggregation of Revenue [Line Items]
Net sales	$ 3,537	$ 2,417

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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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