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Revenue Recognition (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2020 USD ($) day	Jun. 29, 2019 USD ($)	Jun. 27, 2020 USD ($) day	Jun. 29, 2019 USD ($)
Disaggregation of Revenue [Line Items]
Standard terms of payment, number of days | day	10		10
Net sales	$ 698,776	$ 706,448	$ 1,360,846	$ 1,345,149
Warehouse and reload
Disaggregation of Revenue [Line Items]
Net sales	601,279	594,024	1,163,472	1,117,250
Direct
Disaggregation of Revenue [Line Items]
Net sales	107,848	121,856	217,129	245,212
Customer discounts and rebates
Disaggregation of Revenue [Line Items]
Net sales	(10,351)	(9,432)	(19,755)	(17,313)
Structural products
Disaggregation of Revenue [Line Items]
Net sales	249,571	224,528	490,349	421,314
Specialty products
Disaggregation of Revenue [Line Items]
Net sales	$ 449,205	$ 481,920	$ 870,497	$ 923,835

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