Revenue - Revenue by Customer (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 27, 2024	Sep. 29, 2023	Sep. 27, 2024	Sep. 29, 2023
Disaggregation of Revenue [Line Items]
Total revenue	$ 1,081,656	$ 1,001,507	$ 3,164,403	$ 2,922,819
Army
Disaggregation of Revenue [Line Items]
Total revenue	$ 455,877	412,841	$ 1,345,997	1,196,843
Revenue, percent change	10.40%		12.50%
Navy
Disaggregation of Revenue [Line Items]
Total revenue	$ 366,217	311,088	$ 1,037,425	896,976
Revenue, percent change	17.70%		15.70%
Air Force
Disaggregation of Revenue [Line Items]
Total revenue	$ 121,863	134,728	$ 367,899	418,710
Revenue, percent change	(9.50%)		(12.10%)
Other
Disaggregation of Revenue [Line Items]
Total revenue	$ 137,699	$ 142,850	$ 413,082	$ 410,290
Revenue, percent change	(3.60%)		0.70%