Balance Sheet Details - Accounts Receivable and Unbilled Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 25, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total current accounts receivable	$ 330.3	$ 328.9
Allowance for doubtful accounts	(1.1)	(0.4)
Total accounts receivable and unbilled receivables, net	329.2	328.5
U.S. Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total U.S. Government contract receivables	92.0	103.3
Billed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total current accounts receivable	129.8	105.9
Billed | U.S. Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total U.S. Government contract receivables	21.0	15.9
Unbilled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total current accounts receivable	200.5	223.0
Unbilled | U.S. Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total U.S. Government contract receivables	$ 71.0	$ 87.4