Schedule of Net Periodic Pension Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Defined Benefit Plan Net Periodic Benefit Cost [Abstract]
Service cost	$ 2,680	$ 2,791
Interest cost	434	744
Expected return on plan assets	(1,097)	(1,106)
Net period pension cost	$ 2,017	$ 2,429