Balance Sheet Details - Accounts Receivable and Unbilled Receivables (Details) - USD ($) $ in Millions	Dec. 25, 2022	Dec. 26, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total current accounts receivable	$ 328.9	$ 285.1
Allowance for doubtful accounts	(0.4)	(0.4)
Total accounts receivable and unbilled receivables, net	328.5	284.7
U.S. Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total U.S. Government contract receivables	103.3	104.9
Billed
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total current accounts receivable	105.9	94.2
Billed | U.S. Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total U.S. Government contract receivables	15.9	11.3
Unbilled
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total current accounts receivable	223.0	190.9
Unbilled | U.S. Government
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total U.S. Government contract receivables	$ 87.4	$ 93.6