Pension and Post-retirement Benefits - Net Periodic Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1,408	$ 1,031	$ 2,890	$ 2,064
Expected return on plan assets	(960)	(1,098)	(1,992)	(2,198)
Amortization of net loss	10	15	20	28
Total net (benefit)	458	(52)	918	(106)
Post Retirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	5	9	11	18
Interest cost	17	13	35	25
Amortization of prior service credit	(368)	(369)	(737)	(737)
Amortization of net loss	45	47	89	94
Total net (benefit)	$ (301)	$ (300)	$ (602)	$ (600)