Quarterly Financial Data (Unaudited) (Details Textual) (Research and Development Expense [Member], USD $) In Millions, unless otherwise specified	3 Months Ended					12 Months Ended
	Oct. 02, 2011	Jan. 02, 2011	Oct. 03, 2010	Jul. 04, 2010	Apr. 04, 2010	Jan. 02, 2011
Research and Development Expense [Member]
Employee Service Share Based Compensation (Textual) [Abstract]
Tax credits on research and development	$ 2.4	$ 9.0	$ 2.9	$ 0.2	$ 0.4	$ 12.5