Subsequent Event (Details) (USD $) In Millions	1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 29, 2011	Jul. 02, 2010	Jul. 01, 2011
Subsequent Event [Line Items]
Retired remaining Notes due 2033		$ 40.9	$ (82.2)
Subsequent Event (Textuals) [Abstract]
Reduction of accreted value of convertible debt, debt component	11.6	28.6	37.4
Common stock issued for excess conversion value	0.2
Amount of excess conversion value	13.3		1.6
Convertible Notes Due 2033 [Member]
Subsequent Event [Line Items]
Retired remaining Notes due 2033	$ 24.9