Stock-Based Compensation - Summary of Stock Option Plans (Detail) - Stock Options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Number of Shares
Outstanding at beginning of period	51,000	258,000
Granted	0	0	0	0
Exercised	(47,000)	(207,000)
Cancelled	0	0
Outstanding at end of period	4,000	51,000	258,000
Vested and expected to vest at end of period	4,000
Exercisable at end of period	4,000
Weighted Average Exercise Price (in dollars per share)
Outstanding at beginning of period	$ 13.53	$ 13.34
Granted	0.00	0.00
Exercised	14.12	13.29
Cancelled	0.00	0.00
Outstanding at end of period	5.52	$ 13.53	$ 13.34
Vested and expected to vest at end of period	5.52
Exercisable at end of period	$ 5.52
Weighted Average Remaining Contractual Term (Years)
Outstanding at end of period	3 years 1 month 16 days	7 months 6 days	1 year 22 days
Vested and expected to vest at end of period	3 years 1 month 16 days
Exercisable at end of period	3 years 1 month 16 days
Aggregate Intrinsic Value
Outstanding at end of period	$ 114
Vested and expected to vest at end of period	114
Exercisable at end of period	$ 114