Stock Based Compensation Plans (Schedule of Shares of Common Stock under Options for All Plans) (Detail) - Common stock under option - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Shares subject to option
Beginning balance	302	397	551
Shares, Granted	28
Shares subject to option, Exercised	(70)	(95)	(146)
Shares subject to option, Forfeited (including cancelled options)			(8)
Ending balance	260	302	397
Shares subject to option, options exercisable at June 30, 2017	232
Weighted average exercise price per share
Weighted average exercise price per share, beginning balance	$ 7.19	$ 7.28	$ 7.72
Weighted average exercise price per share, granted	20.03
Weighted average exercise price per share, exercised	7.90	7.56	8.74
Weighted average exercise price per share, forfeited (including canceled options)			10.94
Weighted average exercise price per share, ending balance	8.36	$ 7.19	$ 7.28
Weighted average exercise price per share, options exercisable at June 30, 2017	$ 6.98
Aggregate Intrinsic Value, Balance at June 30, 2017	$ 1,968
Aggregate Intrinsic Value, Options exercisable at June 30, 2017	$ 1,968