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Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2025	Sep. 28, 2024	Sep. 27, 2025	Sep. 28, 2024
Disaggregation of Revenue [Line Items]
Net sales	$ 748,870	$ 747,288	$ 2,238,203	$ 2,241,895
Selling, general and administrative expense	89,281	92,210	278,639	272,913
Warehouse and reload
Disaggregation of Revenue [Line Items]
Net sales	627,704	622,981	1,849,479	1,843,942
Direct
Disaggregation of Revenue [Line Items]
Net sales	137,640	140,505	435,222	445,606
Customer discounts and rebates
Disaggregation of Revenue [Line Items]
Net sales	(16,474)	(16,198)	(46,498)	(47,653)
Specialty products
Disaggregation of Revenue [Line Items]
Net sales	525,455	519,000	1,548,301	1,562,300
Structural products
Disaggregation of Revenue [Line Items]
Net sales	223,415	228,288	689,902	679,595
Shipping and Handling
Disaggregation of Revenue [Line Items]
Selling, general and administrative expense	$ 41,100	$ 39,200	$ 121,900	$ 115,000

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