Common Stock Repurchase - Additional Information (Details) - USD ($) $ / shares in Units, shares in Thousands		1 Months Ended	3 Months Ended
	Aug. 03, 2017	Apr. 30, 2014	Mar. 31, 2017	Sep. 30, 2017	May 02, 2017	Apr. 28, 2016
April 2014 Repurchase Program
Share Repurchases [Line Items]
Repurchase of common stock, common stock authorized		$ 300,000,000
Stock repurchase program, period		3 years
Accelerated share repurchase (shares)			40
Market price ($ per share)			$ 96.37
Repurchased			$ 3,800,000
April 2016 Repurchase Program
Share Repurchases [Line Items]
Repurchase of common stock, common stock authorized						$ 300,000,000
2017 ASR
Share Repurchases [Line Items]
Repurchase of common stock, common stock authorized					$ 50,000,000
Accelerated share repurchase (shares)	400
Price ($ per share)	$ 146.48
Amount remaining in repurchase plan				$ 250,000,000