Acquisitions - Contingent Acquisition Consideration (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended
	Apr. 30, 2012	Jun. 24, 2012
Business Acquisition, Contingent Consideration [Line Items]
Balance as of December 25, 2011		$ 7.6
Cash payments		(4.0)
Balance as of June 24, 2012		3.6
Fair value of contingent consideration, current		2.5
Fair value of contingent consideration, noncurrent		1.1
DEI Services Corporation
Business Acquisition, Contingent Consideration [Line Items]
Cash payments	2.5	2.9
Potential reduction to prior and future contingent consideration		(6.0)
DEI Services Corporation | Minimum
Business Acquisition, Contingent Consideration [Line Items]
Potential cash payment for contingent consideration		2.0
DEI Services Corporation | Maximum
Business Acquisition, Contingent Consideration [Line Items]
Potential cash payment for contingent consideration		$ 4.5