Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended			9 Months Ended		12 Months Ended		1 Months Ended	3 Months Ended
	Apr. 30, 2013	Sep. 29, 2013	Mar. 31, 2013	Sep. 30, 2012	Sep. 29, 2013	Sep. 30, 2012	Dec. 30, 2012	Jun. 24, 2012 buyer	Jun. 30, 2012 Discontinued operations	Jun. 24, 2012 Discontinued operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Goodwill impairment charge associated with discontinued operations									$ 1.5	$ 1.5
Number of buyers of divested business								2
Total cash and assumption of liabilities for divested operations		0.8			0.8
Cash received for divested operations	0.5						0.3
Impairment charge related to revised estimate of the fair value of divested operations			1.2
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenue		0		6.0	3.6	13.3
Net income (loss) before taxes		(0.4)		0.2	(4.8)	(2.7)
Provision for income taxes		0		0	0	(0.1)
Net income (loss) after taxes		(0.4)		0.2	(4.8)	(2.6)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Accounts receivable, net		0			0		3.4
Inventoried costs		0			0		3.0
Other current assets		0			0		0.2
Current assets of discontinued operations		0			0		6.6
Property and equipment, net		0			0		0.4
Other non-current assets		0			0		0.4
Non-current assets of discontinued operations		0			0		0.8
Accounts payable and accrued expenses		2.9			2.9		4.4
Billings in excess of costs and earnings on uncompleted contracts		0			0		0.1
Other current liabilities		0.3			0.3		0.4
Current liabilities of discontinued operations		3.2			3.2		4.9
Other long-term liabilities		0			0		0.3
Long-term liabilities of discontinued operations		$ 0			$ 0		$ 0.3