Schedule of Net Periodic Pension Costs (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Defined Benefit Plan Net Periodic Benefit Cost [Abstract]
Service cost	$ 871	$ 637	$ 1,768	$ 1,320
Interest cost	38	103	78	214
Expected return on plan assets	(175)	(261)	(356)	(541)
Net amortization	561	17	397	63
Net periodic pension costs	$ 1,295	$ 496	$ 1,887	$ 1,056