Balance Sheet Details (Tables)

12 Months Ended

Dec. 28, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Accounts, Notes, Loans and Financing Receivable

Accounts receivable, net (in millions)

Receivables including amounts due under long-term contracts are summarized as follows:

	December 29, 2013			December 28, 2014
Billed, current	$	150.2		$	133.6
Unbilled, current	117.9			116.6
Total current accounts receivable	268.1			250.2
Allowance for doubtful accounts	(2.3		)	(2.0		)
Total current accounts receivable, net	265.8			248.2
Unbilled, long-term (included in other assets)	0.1			—
Total accounts receivable, net	$	265.9		$	248.2

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

	December 29, 2013		December 28, 2014
Billed	$	19.8	$	19.1
Unbilled	31.6		21.2
Total U.S. Government contract receivables	$	51.4	$	40.3

Schedule of Inventory, Current

Inventoried costs, net of progress payments (in millions)

	December 29, 2013			December 28, 2014
Raw materials	$	44.5		$	39.8
Work in process	24.3			22.3
Finished goods	4.6			4.7
Supplies and other	1.9			2.1
Subtotal inventoried costs	75.3			68.9
Less customer advances and progress payments	(0.7		)	(0.9		)
Total inventoried costs	$	74.6		$	68.0

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 and equipment, net (in millions)

	December 29, 2013			December 28, 2014
Land and buildings	$	21.0		$	21.8
Computer equipment and software	20.0			27.0
Machinery and equipment	59.0			59.8
Furniture and office equipment	15.4			12.9
Facility under capital lease	1.0			—
Leasehold improvements	13.7			13.8
Construction in progress	4.8			8.0
Property and equipment	134.9			143.3
Accumulated depreciation and amortization	(50.1		)	(60.7		)
Total property and equipment, net	$	84.8		$	82.6