Significant Customers - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 25, 2022	Dec. 26, 2021
Revenue, Major Customer [Line Items]
Revenue	$ 1,037.1	$ 898.3	$ 811.5
KGS
Revenue, Major Customer [Line Items]
Revenue	824.9	676.6
U.S. Government | KGS
Revenue, Major Customer [Line Items]
Revenue	$ 712.7	$ 623.7	$ 571.1
U.S. Government | KGS | Revenue Benchmark | Customer Concentration Risk
Revenue, Major Customer [Line Items]
Sales to the U.S. Government, percentage of total revenue (percent)	69.00%	69.00%	70.00%