Employee Benefits - Components of Net Pension Expense for All Plans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 40	$ 47
Weighted-average assumptions:
Discount rate	2.60%	3.50%
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	40	47
Expected return on assets	(38)	(34)
Amortization of prior service cost	78	123
Settlement cost	0	0
Net pension expense	$ 80	$ 136