Pension and Post-retirement Benefits - Net Periodic Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1,464	$ 1,026	$ 4,354	$ 3,090
Expected return on plan assets	(1,015)	(1,092)	(3,007)	(3,290)
Amortization of net loss	10	14	30	42
Total	459	(52)	1,377	(158)
Post Retirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	9	17	27
Interest cost	18	12	53	37
Amortization of prior service credit	(369)	(369)	(1,106)	(1,106)
Amortization of net loss	44	48	133	142
Total	$ (301)	$ (300)	$ (903)	$ (900)