Common Stock - Narrative (Details) - USD ($)	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Apr. 18, 2018	Jun. 08, 2017	Apr. 26, 2016	Jan. 22, 2015
Common Stock
Approved stock repurchase program, authorized amount				$ 200,000,000	$ 200,000,000	$ 400,000,000	$ 450,000,000
Repurchase of common stock (in shares)	2,797,623	5,185,257	4,750,692
Repurchase of common stock, amount	$ 200,000,000	$ 375,000,000	$ 180,066,000
Remaining capacity under the stock repurchase program	346,300,000
Accelerated Share Repurchase Program [Member]
Common Stock
Repurchase of common stock (in shares)		2,106,709
Repurchase of common stock, amount		$ 100,000,000
Open Market Transaction [Member]
Common Stock
Repurchase of common stock, amount	$ 200,000,000	$ 275,000,000