Employee Benefits - Components of Net Pension Expense for All Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 56	$ 55
Weighted-average assumptions:
Discount rate	4.10%	3.80%
Expected return on plan assets	4.00%	4.00%
Rate of compensation increase	0.00%	0.00%
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 0	$ 0
Interest cost	56	55
Expected return on assets	(36)	(36)
Amortization of prior service cost	78	125
Settlement cost	39	15
Net pension expense	$ 137	$ 159