Balance Sheet Details (Tables)

12 Months Ended

Dec. 31, 2023

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 31, 2023		December 25, 2022
Billed, current	$	129.8	$	105.9
Unbilled, current	200.5		223.0
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 contract receivables where the Company is the prime contractor included in accounts receivable, net (in millions):

	December 31, 2023		December 25, 2022
Billed	$	21.0	$	15.9
Unbilled	71.0		87.4
Total U.S. Government contract receivables	$	92.0	$	103.3

Schedule of Inventory

Inventoried costs (in millions): 

	December 31, 2023		December 25, 2022
Raw materials	$	78.0	$	73.6
Work in process	72.9		50.8
Finished goods	5.3		1.1
Total inventoried costs	$	156.2	$	125.5

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 31, 2023		December 25, 2022
Finance lease right of use assets	$	56.1	$	54.9
Land and buildings	40.8		38.4
Computer equipment and software	51.4		45.7
Machinery and equipment	152.8		129.9
Furniture and office equipment	8.2		7.6
Leasehold improvements	24.0		22.9
Construction in progress	69.7		51.0
Property and equipment	403.0		350.4
Accumulated depreciation and amortization	(159.4)		(137.3)
Total property and equipment, net	$	243.6	$	213.1