Retirement Plans (Narrative) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Compensation And Retirement Disclosure [Abstract]
Provision for defined contribution plans	$ 1,957	$ 1,849	$ 1,474
Accrued pension liability	853	926
Net periodic pension costs, principally of interest cost and service cost	$ 28	$ 53	$ 80
Actuarial present value of benefit obligations, assumed weighted average discount rate	1.90%	1.60%	3.00%
Actuarial present value of benefit obligations, assumed compensation increase rate	0.00%	0.00%	0.00%
Liability under the deferred compensation plans, total	$ 3,046	$ 2,974
Liability under the deferred compensation plans, long-term	3,028	2,855
Liability under the deferred compensation plans, current	18	119
Deferred compensation plan assets	$ 2,693	$ 2,550