Balance Sheet Details (Tables)

12 Months Ended

Dec. 30, 2012

Balance Sheet Details Disclosure [Abstract]

Schedule of Cash and Cash Equivalents

The cash and cash equivalents at December 25, 2011 and December 30, 2012 were as follows:

	December 25, 2011				December 30, 2012
	Amortized Cost Basis		Level 1 Fair Value Basis		Amortized Cost Basis		Level 1 Fair Value Basis
Cash and cash equivalents	$	69.6	$	69.6	$	49.0	$	49.0

Schedule of Accounts, Notes, Loans and Financing Receivable

U.S. Government contract receivables (included in accounts receivable, net)

	December 25, 2011		December 30, 2012
Billed	$	41.2	$	24.6
Unbilled	43.3		39.4
Total U.S. Government contract receivables	$	84.5	$	64.0

Accounts receivable, net

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

	December 25, 2011			December 30, 2012
Billed, current	$	128.7		$	137.9
Unbilled, current	118.6			135.4
Total current accounts receivable	247.3			273.3
Allowance for doubtful accounts	(2.0		)	(1.4		)
Total current accounts receivable, net	245.3			271.9
Unbilled, long-term (included in other assets)	0.3			0.3
Total accounts receivable, net	$	245.6		$	272.2

Schedule of Inventory, Current

Inventoried costs, net of progress payments

	December 25, 2011			December 30, 2012
Raw materials	$	43.3		$	48.4
Work in process	25.7			36.5
Finished goods	6.9			7.3
Supplies and other	4.0			2.2
Subtotal inventoried costs	79.9			94.4
Less customer advances and progress payments	(3.3		)	(0.1		)
Total inventoried costs	$	76.6		$	94.3

Property, Plant and Equipment

Assets are depreciated 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

	December 25, 2011			December 30, 2012
Land and buildings	$	20.6		$	20.8
Computer equipment and software	17.8			17.2
Machinery and equipment	37.5			49.9
Furniture and office equipment	8.3			12.2
Facility under capital lease	1.0			1.6
Leasehold improvements	8.2			13.3
Construction in progress	1.7			5.8
Property and equipment	95.1			120.8
Accumulated depreciation and amortization	(22.6		)	(35.2		)
Total property and equipment, net	$	72.5		$	85.6