Employee Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in OCI (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Change In Benefit Obligation [Roll Forward]
Projected postretirement benefit obligation at end of year	$ 134,161	$ 99,207	$ 106,459	$ 134,161
Interest cost		4,624	3,391	3,437
Unrecognized actuarial loss		5,140	24,713
Defined Benefit Plan, Benefit Obligation, Benefits Paid		6,736	6,380
Change in plan assets
Fair value of plan assets at the beginning of the year		78,098	95,111
Employer contributions		2,082	1,312
Benefits paid		(6,736)	(6,380)
Fair value of plan assets at the end of the year	95,111	79,624	78,098	95,111
Projected postretirement benefit obligation at end of year	134,161	99,207	106,459	134,161
Funded status at end of year (underfunded)		(19,583)	(28,361)
Amounts recognized in consolidated balance sheets
Noncurrent liabilities		(19,583)	(28,361)
Other Postretirement Benefits Plan
Change In Benefit Obligation [Roll Forward]
Projected postretirement benefit obligation at end of year	1,012	826	844	1,012
Service cost	19	0	0
Interest cost	293	39	27
Unrecognized actuarial loss		57	195
Defined Benefit Plan, Benefit Obligation, Benefits Paid		0	0
Change in plan assets
Fair value of plan assets at the beginning of the year		0	0
Employer contributions			0	0
Benefits paid			0	0
Fair value of plan assets at the end of the year	0	0	0	0
Projected postretirement benefit obligation at end of year	$ 1,012	826	844	$ 1,012
Funded status at end of year (underfunded)		(826)	(844)
Amounts recognized in consolidated balance sheets
Current liabilities		(61)	(57)
Noncurrent liabilities		(765)	(787)
Liability, Defined Benefit Plan		$ (826)	$ (844)