Acquisitions - Contingent Acquisition Consideration (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended				1 Months Ended	12 Months Ended		3 Months Ended	12 Months Ended
	Dec. 29, 2013	Dec. 30, 2012	Dec. 29, 2013 SecureInfo	Dec. 30, 2012 SecureInfo	Apr. 30, 2013 DEI	Dec. 29, 2013 DEI	Dec. 30, 2012 DEI	Dec. 30, 2012 SCT	Dec. 29, 2013 SCT	Dec. 30, 2012 SCT	Dec. 25, 2011 SCT
Business Acquisition, Contingent Consideration [Roll Forward]
Beginning balance	$ 2.1	$ 7.6	$ 0	$ 1.5		$ 2.1	$ 5.0		$ 0	$ 1.1
Cash payments	(2.1)	(4.0)	0	(1.5)		(2.1)	(2.5)		0	0
Post acquisition adjustments reflected in operating results		(1.5)		0			(0.4)			(1.1)
Ending balance	0	2.1	0	0		0	2.1	0	0	0	1.1
Change in fair value of contingent acquisition consideration					$ 2.1	$ 5.0		$ 1.1
Discount rate used in valuing contingent consideration											6.10%