Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended	12 Months Ended			3 Months Ended
	Apr. 30, 2013	Mar. 31, 2013	Dec. 29, 2013 buyer	Dec. 30, 2012	Dec. 25, 2011	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				$ 82.0		$ 1.5
Number of buyers of divested business			2
Total cash and assumptions of liabilities for divested operations			0.8
Cash consideration received from divestiture	0.5			0.3
Impairment charge related to management's estimate of the fair value of the business		1.2
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Revenue			3.7	18.5	9.2
Loss before taxes			(5.3)	(1.8)	(1.3)
Benefit for income taxes			0	(0.3)	(0.6)
Net loss			(5.3)	(1.5)	(0.7)
Disposal Group, Including Discontinued Operation, Balance Sheet Disclosures [Abstract]
Accounts receivable, net			0	3.4
Inventoried costs			0	3.0
Other current assets			0	0.2
Current assets of discontinued operations			0	6.6
Property and equipment, net			0	0.4
Other assets			0	0.4
Long-term assets of discontinued operations			0	0.8
Accrued expenses and accounts payable			1.1	4.4
Billings in excess of costs and earnings on uncompleted contracts			0	0.1
Other current liabilities			1.4	0.4
Current liabilities of discontinued operations			2.5	4.9
Other long-term liabilities			0.2	0.3
Long-term liabilities of discontinued operations			$ 0.2	$ 0.3