Employee Benefits - Components of Net Pension Expense for All Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 47	$ 56
Weighted-average assumptions:
Discount rate	3.50%	4.10%
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	47	56
Expected return on assets	(34)	(36)
Amortization of prior service cost	123	78
Settlement cost	0	39
Net pension expense	$ 136	$ 137