Employee Benefits - Components of Net Pension Expense for All Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 65	$ 60
Weighted-average assumptions:
Discount rate	4.50%	4.50%	4.50%
Expected return on plan assets	4.00%	4.00%	4.00%
Rate of compensation increase	0.00%	0.00%	0.00%
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0	$ 0
Interest cost	65	60	59
Expected return on assets	(35)	(34)	(30)
Amortization of prior service cost	113	100	129
Settlement cost	38	0	0
Net pension expense	$ 181	$ 126	$ 158