Pension and Post-retirement Benefits - Net Periodic Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 1,026	$ 1,120	$ 3,090	$ 3,351
Expected return on plan assets	(1,092)	(1,115)	(3,290)	(3,336)
Amortization of net loss	14	13	42	40
Total	(52)	18	(158)	55
Post Retirement Medical Plan
Defined Benefit Plan Disclosure [Line Items]
Service cost	9	21	27	64
Interest cost	12	51	37	154
Amortization of prior service credit	(369)	(134)	(1,106)	(403)
Amortization of net loss	48	41	142	124
Total	$ (300)	$ (21)	$ (900)	$ (61)