Post-Retirement Benefits - Schedule of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Employee Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 149	$ 136	$ 446	$ 409
Expected return on plan assets	(509)	(454)	(1,528)	(1,365)
Amortization of prior net loss	38	240	113	719
Settlement charges		65		158
Net periodic (benefit) cost	(322)	(13)	(969)	(79)
Supplemental Retirement Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	82	130	343	311
Interest cost	25	18	60	65
Amortization of prior net loss	17	14	49	42
Net periodic (benefit) cost	$ 124	$ 162	$ 452	$ 418