Balance Sheet Details (Tables)

12 Months Ended

Dec. 26, 2021

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 26, 2021		December 27, 2020
Billed, current	$	94.2	$	97.0
Unbilled, current	190.9		177.1
Total current accounts receivable	285.1		274.1
Allowance for doubtful accounts	(0.4)		(1.8)
Total accounts receivable and unbilled receivables, net	$	284.7	$	272.3

U.S. Government contract receivables where the Company is the prime contractor included in accounts receivable, net (in millions):

	December 26, 2021		December 27, 2020
Billed	$	11.3	$	19.5
Unbilled	93.6		77.9
Total U.S. Government contract receivables	$	104.9	$	97.4

Schedule of Inventory

Inventoried costs (in millions): 

	December 26, 2021		December 27, 2020
Raw materials	$	58.5	$	47.3
Work in process	28.5		30.1
Finished goods	4.7		3.8
Total inventoried costs	$	91.7	$	81.2

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 26, 2021		December 27, 2020
Finance lease right of use assets	$	46.4	$	40.6
Land and buildings	19.8		19.1
Computer equipment and software	40.0		37.0
Machinery and equipment	109.1		105.3
Furniture and office equipment	7.6		7.9
Leasehold improvements	16.9		15.0
Construction in progress	45.3		18.2
Property and equipment	285.1		243.1
Accumulated depreciation and amortization	(116.8)		(99.3)
Total property and equipment, net	$	168.3	$	143.8