Stockholders' Equity (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended			3 Months Ended	12 Months Ended
	Apr. 23, 2013	Oct. 24, 2012	Nov. 01, 2011	Sep. 30, 2013	Jun. 30, 2013
Stockholders' Equity
Approved stock repurchase program, authorized amount	$ 150	$ 100	$ 100
Repurchase of common stock (in shares)				869,847	3,064,151
Repurchase of common stock, amount				28.9	84.7
Remaining capacity under the stock repurchase program	58.4			105.5
Accumulated Other Comprehensive Income
Foreign translation adjustments				8.7	7.3
Net unrealized gains (losses) on available for sale securities					(0.1)
Maximum
Accumulated Other Comprehensive Income
Net unrealized gains (losses) on available for sale securities				$ 0.1