Interest and Other Income (Schedule of Interest and other income) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Other Income And Expenses [Abstract]
Dividends	$ 277	$ 222	$ 233
Interest	264	313	282
Foreign government subsidies received	64	25	22
Joint venture equity earnings	2,336	2,060	1,761
Foreign currency (losses) gains	(298)	56	(1,065)
Deferred compensation plan losses	(257)	(35)	(96)
Rental income	158	154	151
Miscellaneous income	33	28	198
Interest and other income	$ 2,577	$ 2,823	$ 1,486