Stockholders' Deficit - Stock Repurchase Program (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2020	Jul. 22, 2020	Apr. 17, 2019	Dec. 06, 2018	Apr. 18, 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	$ 200,000	$ 100,000	$ 200,000	$ 200,000	$ 400,000	$ 450,000
Repurchase of common stock, amount		$ (50,000)	$ (50,000)	$ (50,000)
Remaining capacity under the stock repurchase program	$ 200,000
Share repurchases
Class of Stock [Line Items]
Repurchase of common stock (in shares)	0	451,991			1,252,289
Repurchase of common stock, amount		$ (50,000)			$ (150,000)