Employee Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in OCI (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
Change In Benefit Obligation [Roll Forward]
Projected postretirement benefit obligation at end of year	$ 138,412,000	$ 106,459,000	$ 134,161,000	$ 138,412,000
Interest cost		3,391,000	3,437,000	4,236,000
Unrecognized actuarial loss		24,713,000	1,443,000
Defined Benefit Plan, Benefit Obligation, Benefits Paid		6,380,000	6,245,000
Change in plan assets
Fair value of plan assets at the beginning of the year		95,111,000	79,819,000
Employer contributions		1,312,000	3,063,000
Benefits paid		(6,380,000)	(6,245,000)
Fair value of plan assets at the end of the year	79,819,000	78,098,000	95,111,000	79,819,000
Projected postretirement benefit obligation at end of year	138,412,000	106,459,000	134,161,000	138,412,000
Funded status at end of year (underfunded)		(28,361,000)	(39,050,000)
Amounts recognized in consolidated balance sheets
Current liabilities		0	(50,000)
Noncurrent liabilities		(28,361,000)	(39,050,000)
Other Postretirement Benefits Plan
Change In Benefit Obligation [Roll Forward]
Projected postretirement benefit obligation at end of year	10,739,000	844,000	1,012,000	10,739,000
Service cost	446,000	0	19,000
Interest cost	725,000	27,000	293,000
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		0	233,000
Unrecognized actuarial loss		195,000	(151,000)
Defined Benefit Plan, Termination Of Benefits		0	(9,290,000)
Defined Benefit Plan, Benefit Obligation, Benefits Paid		0	1,133,000
Change in plan assets
Fair value of plan assets at the beginning of the year		0	0
Employer contributions			0	1,068,000
Participant contributions			0	232,000
Settlements			0	(167,000)
Benefits paid			0	(1,133,000)
Fair value of plan assets at the end of the year	0	0	0	0
Projected postretirement benefit obligation at end of year	$ 10,739,000	844,000	1,012,000	$ 10,739,000
Funded status at end of year (underfunded)		(844,000)	(1,012,000)
Amounts recognized in consolidated balance sheets
Current liabilities		(57,000)	(52,000)
Noncurrent liabilities		(787,000)	(960,000)
Liability, Defined Benefit Plan		$ (844,000)	$ (1,012,000)