Stockholders' Equity - Stock Repurchase Plan (Details) - USD ($) $ / shares in Units, shares in Thousands		12 Months Ended	15 Months Ended
	Feb. 28, 2015	Mar. 31, 2016	Mar. 31, 2016	Jan. 31, 2016	Jun. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum stock repurchase amount approved by Board of Directors					$ 200,000,000
Number of shares repurchased	3,823,000
Average stock price of shares repurchased (in dollars per share)	$ 52.31
Repurchase of common stock, payments	$ 200,000,000
Remaining stock repurchase amount approved by Board of Directors				$ 200,000,000
Two Thousand Fifteen Stock Repurchase Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Remaining stock repurchase amount approved by Board of Directors		$ 77,900,000	$ 77,900,000
Treasury Stock, Shares, Acquired		1,420,000
Treasury Stock, Value, Acquired, Cost Method		$ 94,200,000
Treasury Stock Acquired, Average Cost Per Share		$ 66.32	$ 67.95
Treasury Stock, Number of Shares Held		1,797,000	1,797,000
Treasury Stock, Value		$ 122,100,000	$ 122,100,000