Stock-based Compensation - RSU Activity (Details) - $ / shares	9 Months Ended	12 Months Ended
	Mar. 31, 2019	Jun. 30, 2018
RSU
RSUs Outstanding
Balance at beginning of period (in shares)	1,480,605
Granted (in shares)	738,880
Vested (in shares)	(439,379)
Forfeited (in shares)	(114,018)
Balance at end of period (in shares)	1,666,088	1,480,605
Weighted Average Grant-Date Fair Value per Share
Balance at beginning of period (in dollars per share)	$ 23.34
Granted (in dollars per share)	16.46
Vested (in dollars per share)	24.83
Forfeited (in dollars per share)	20.76
Balance at end of period (in dollars per share)	$ 20.08	$ 23.34
Vested in period, not released (in shares)	101,952
PRSU
RSUs Outstanding
Balance at beginning of period (in shares)	120,000
Granted (in shares)	0
Vested (in shares)	0
Forfeited (in shares)	0
Balance at end of period (in shares)	120,000	120,000
Weighted Average Grant-Date Fair Value per Share
Balance at beginning of period (in dollars per share)	$ 27.10
Balance at end of period (in dollars per share)	$ 27.10	$ 27.10
Vested in period, not released (in shares)	78,000	60,000