Post-Retirement Benefits - Summary of Net Period Pension Cost (Benefit), Contributions and Benefits Paid (Detail) - Employee Pension Plan [Member] - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Net period pension benefit	$ (124)	$ (266)
Benefits paid	$ 922	$ 948