Employee Benefit Plans - Other Changes in Plan Assets and Benefit Obligations Recognized in OCI (Details) - USD ($)	3 Months Ended	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Change In Benefit Obligation [Roll Forward]
Projected benefit obligation	$ 126,227,000	$ 134,161,000	$ 138,412,000	$ 126,227,000
Interest cost		3,437,000	4,236,000
Unrecognized actuarial loss		1,443,000	(13,994,000)
Defined Benefit Plan, Benefit Obligation, Benefits Paid		6,245,000	6,045,000
Change in plan assets
Fair value of plan assets at measurement date	79,189,000	95,111,000	79,819,000	79,189,000
Employer contributions		3,063,000	3,054,000
Defined Benefit Plan, Plan Assets, Benefits Paid		(6,245,000)	(6,045,000)
Projected benefit obligation	126,227,000	134,161,000	138,412,000	126,227,000
Defined Benefit Plan, Funded (Unfunded) Status of Plan		(39,050,000)	(58,593,000)
Amounts recognized in consolidated balance sheets
Cumulative preferred dividends, undeclared and unpaid		2,051,000	1,477,000
Liability, Defined Benefit Plan, Noncurrent		39,050,000	58,593,000
Amounts Recognized in Balance Sheet		(39,050,000)	(58,593,000)
Other Postretirement Benefits Plan
Change In Benefit Obligation [Roll Forward]
Projected benefit obligation	24,092,000	1,012,000	10,739,000	24,092,000
Service cost	530,000	19,000	446,000
Interest cost	887,000	293,000	725,000
Defined Benefit Plan, Benefit Obligation, Contributions by Plan Participant		233,000	593,000
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment		0	(13,441,000)
Unrecognized actuarial loss		(151,000)	621,000
Defined Benefit Plan, Termination Of Benefits		(9,290,000)	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid		1,133,000	1,055,000
Change in plan assets
Fair value of plan assets at measurement date	0	0	0	0
Employer contributions			1,068,000	462,000
Defined Benefit Plan, Plan Assets, Contributions by Plan Participant			232,000	593,000
Defined Benefit Plan, Benefit Obligation, Payment for Settlement			(167,000)	0
Defined Benefit Plan, Plan Assets, Benefits Paid			(1,133,000)	(1,055,000)
Projected benefit obligation	$ 24,092,000	1,012,000	10,739,000	$ 24,092,000
Defined Benefit Plan, Funded (Unfunded) Status of Plan		(1,012,000)	(10,739,000)
Amounts recognized in consolidated balance sheets
Cumulative preferred dividends, undeclared and unpaid		52,000	746,000
Liability, Defined Benefit Plan, Noncurrent		960,000	9,993,000
Amounts Recognized in Balance Sheet		$ (1,012,000)	$ (10,739,000)