Valuation and Qualifying Accounts (Detail) - Allowance for Doubtful Accounts - USD ($) $ in Thousands		12 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of year		$ 513	$ 691	$ 517
Charged to costs and expenses		(3)	76	484
Charged to other accounts
Deductions	[1]	25	254	310
Balance at end of year		$ 485	$ 513	$ 691

[1] Specific accounts written off as uncollectible.