Common Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended			3 Months Ended	12 Months Ended
	Nov. 02, 2011	Oct. 31, 2011	Oct. 29, 2010	Sep. 30, 2012	Jun. 30, 2012
Common Stock
Approved stock repurchase program, authorized amount	$ 100		$ 40
Remaining capacity under the stock repurchase program		17.0		49.2
Repurchase of common stock (in shares)				716,605	2,496,595
Repurchase of common stock, amount				$ 17.2	$ 46.1