Employee Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure
Interest cost		$ 3,391	$ 3,437	$ 4,236
Amortization of prior service credit		(1,356)	(2,010)	(1,479)
Pension settlement charge		$ (201)	$ 1,296	$ 1,309
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]		Interest Expense	Interest Expense	Interest Expense
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure
Service cost	$ 446	$ 0	$ 19
Interest cost	725	27	293
Amortization of net gain	(3,067)	11	(5,296)
Curtailment credit - Retiree Medical	5,750	0	0
Amortization of prior service credit	(5,666)	0	(8,961)
Settlement credit - Retiree Medical	0	0	(6,669)
Pension settlement charge	$ (13,312)	$ 38	$ (20,614)