Subsequent Events (Details) (1% senior convertible notes, USD $) In Millions, unless otherwise specified	3 Months Ended				0 Months Ended
	Dec. 29, 2012	Sep. 29, 2012	Dec. 31, 2011	Jun. 05, 2006	Jan. 02, 2013 Subsequent event
Subsequent Events
Principal amount of debt repurchased	$ 50.0	$ 50.0			$ 50.0
Interest rate on Senior convertible notes (as a percent)	1.00%		1.00%	1.00%	1.00%
Cash paid for repurchase of debt	$ 49.9	$ 49.8			$ 50.0