Employee Benefit Plans - Components of Net Periodic Benefit Costs (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Defined Benefit Plan Disclosure
Interest cost		$ 4,624	$ 3,391	$ 3,437
Amortization of prior service credit		(1,125)	(1,356)	(2,010)
Pension settlement charge		$ 1,714	$ (201)	$ 1,296
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	$ 19	$ 0	$ 0
Interest cost	293	39	27
Amortization of net gain	(5,296)	0	11
Amortization of prior service credit	(8,961)	0	0
Settlement credit - Retiree Medical	(6,669)	0	0
Pension settlement charge	$ (20,614)	$ 39	$ 38