Pension and Post-retirement Benefits - Net Periodic Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1,552	$ 1,482
Expected return on plan assets	(1,098)	(1,032)
Amortization of net loss	10	10
Total	464	460
Post Retirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	6
Interest cost	17	18
Amortization of prior service credit	(369)	(369)
Amortization of net loss	31	44
Total	$ (316)	$ (301)