Stockholders' Equity Fiscal Year 2013 Share Repurchase Plan (Details) - USD ($) $ / shares in Units, shares in Millions	1 Months Ended		3 Months Ended			5 Months Ended	7 Months Ended	12 Months Ended		13 Months Ended	15 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Mar. 31, 2016	Sep. 30, 2013	Mar. 31, 2013	Jul. 31, 2013	Mar. 31, 2013	Jun. 30, 2015	Jun. 30, 2014	Jul. 31, 2013	Sep. 30, 2013	Aug. 01, 2013
Treasury Stock, Value, Acquired, Cost Method									$ 197,600,000
PercentOfSharesReceivedUnderASR			80.00%					80.00%
FiscalYear2013StockRepurchasePlan [Member]
Stock Repurchase Program, Authorized Amount												$ 200,000,000
Treasury Stock, Value, Acquired, Cost Method											$ 200,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount									2,400,000
Treasury Stock, Shares, Acquired											5.5
Treasury Stock Acquired, Average Cost Per Share											$ 36.64
September 2012 Accelerated Share Repurchase [Member]
Treasury Stock, Value, Acquired, Cost Method							$ 50,000,000		$ 50,000,000
Treasury Stock, Shares, Acquired		1.3			0.2		1.6
Treasury Stock Acquired, Average Cost Per Share							$ 31.98
March 2013 Accelerated Share Repurchase [Member]
Treasury Stock, Value, Acquired, Cost Method						$ 50,000,000
Treasury Stock, Shares, Acquired	1.0			0.1		1.1
PercentOfSharesReceivedUnderASR									80.00%
Treasury Stock Acquired, Average Cost Per Share						$ 43.62			$ 38.28
September Open Market Repurchases [Member]
Treasury Stock, Value, Acquired, Cost Method									$ 50,000,000
Open Market Repurchases [Member]
Treasury Stock, Value, Acquired, Cost Method									$ 97,600,000	$ 100,000,000
Treasury Stock, Shares, Acquired				0.1					2.7	2.7
Treasury Stock Acquired, Average Cost Per Share									$ 36.17	$ 36.38