Stockholders' Deficit - Stock Repurchase Program (Details) - USD ($)	3 Months Ended	9 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	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	$ 196,300,000	$ 196,300,000
Open Market Transaction
Class of Stock [Line Items]
Repurchase of common stock (in shares)	649,479	2,244,987
Repurchase of common stock, amount	$ 50,000,000	$ 150,000,000