Commitments and Contingencies (Details) (Lawsuit for misappropriation of trade secrets, USD $) In Millions, unless otherwise specified	1 Months Ended			3 Months Ended
	Dec. 27, 2009	Jul. 31, 2008 Advanced Management Technology, Inc.	Dec. 30, 2007 Advanced Management Technology, Inc.	Jan. 01, 2012 Advanced Management Technology, Inc.	Oct. 28, 2011 Advanced Management Technology, Inc.
Loss contingencies
Awarded compensatory damages			$ 5.8
Awarded punitive damages			17
Reduced compensatory damages		2.0
Reduced punitive damages		5.8
Outstanding judgment, including post-judgment interest					12.9
Attorneys' fees and costs	2.9
Value of bond posted as required by trial court				13.4
Reasonably possible loss exposure including attorneys' fees, low end of range				0
Reasonably possible loss exposure including attorneys' fees, high end of range				$ 14.5