Balance Sheet Details (Tables)

12 Months Ended

Dec. 25, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

Receivables including amounts due under long-term contracts are summarized as follows (in millions):

	December 25, 2022		December 26, 2021
Billed, current	$	105.9	$	94.2
Unbilled, current	223.0		190.9
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 contract receivables where the Company is the prime contractor included in accounts receivable, net (in millions):

	December 25, 2022		December 26, 2021
Billed	$	15.9	$	11.3
Unbilled	87.4		93.6
Total U.S. Government contract receivables	$	103.3	$	104.9

Schedule of Inventory

Inventoried costs (in millions): 

	December 25, 2022		December 26, 2021
Raw materials	$	73.6	$	58.5
Work in process	50.8		28.5
Finished goods	1.1		4.7
Total inventoried costs	$	125.5	$	91.7

Schedule of Property, Plant and Equipment

Assets are depreciated predominately using the straight-line method, with the following lives:

	Years
Buildings and improvements	15 – 39
Machinery and equipment	3 – 20
Computer equipment and software	1 – 10
Vehicles, furniture, and office equipment	5
Leasehold improvements	Shorter of useful life or length of lease

Property, plant and equipment, net (in millions)

	December 25, 2022		December 26, 2021
Finance lease right of use assets	$	54.9	$	46.4
Land and buildings	38.4		19.8
Computer equipment and software	45.7		40.0
Machinery and equipment	129.9		109.1
Furniture and office equipment	7.6		7.6
Leasehold improvements	22.9		16.9
Construction in progress	51.0		45.3
Property and equipment	350.4		285.1
Accumulated depreciation and amortization	(137.3)		(116.8)
Total property and equipment, net	$	213.1	$	168.3