Stockholders' Deficit - Stock Repurchase Program (Details) - USD ($)	3 Months Ended	6 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Jun. 08, 2017	Apr. 26, 2016	Jan. 22, 2015
Class of Stock [Line Items]
Approved stock repurchase program, authorized amount (up to)			$ 200,000,000.0	$ 400,000,000.0	$ 450,000,000.0
Remaining capacity under the stock repurchase program	$ 246,300,000	$ 246,300,000
Open Market Transaction
Class of Stock [Line Items]
Repurchase of common stock (in shares)	756,349	1,595,508
Repurchase of common stock, amount	$ 50,000,000	$ 100,000,000