Balance Sheet Details (Tables)

12 Months Ended

Dec. 29, 2019

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 29, 2019			December 30, 2018
Billed, current	$	86.6		$	66.5
Unbilled, current	179.7			173.2
Total current accounts receivable	266.3			239.7
Allowance for doubtful accounts	(1.9		)	(2.3		)
Total accounts receivable and unbilled receivables, net	$	264.4		$	237.4

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

	December 29, 2019		December 30, 2018
Billed	$	16.6	$	16.5
Unbilled	86.4		83.1
Total U.S. Government contract receivables	$	103.0	$	99.6

Schedule of Inventory, Current

Inventoried costs, net of progress payments (in millions): 

	December 29, 2019		December 30, 2018
Raw materials	$	39.1	$	34.7
Work in process	20.3		10.3
Finished goods	1.7		1.8
Total inventoried costs	$	61.1	$	46.8

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 – 10
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 29, 2019			December 30, 2018
Finance lease right of use assets	$	39.6		$	—
Land and buildings	$	12.2		$	11.9
Computer equipment and software	32.7			28.3
Machinery and equipment	78.7			56.8
Furniture and office equipment	7.1			6.3
Leasehold improvements	12.3			10.9
Construction in progress	16.0			21.5
Property and equipment	198.6			135.7
Accumulated depreciation and amortization	(81.7		)	(68.6		)
Total property and equipment, net	$	116.9		$	67.1