Defined Benefit Pension Plan - Percentage of fair value (Details)	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Change in Fair Value of Plan Asset, Percentage	100.00%	100.00%
Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Change in Fair Value of Plan Asset, Percentage	15.50%	0.90%
Equities - Large Cap
Defined Benefit Plan Disclosure [Line Items]
Change in Fair Value of Plan Asset, Percentage	29.20%	48.60%
Equities - Mid Cap
Defined Benefit Plan Disclosure [Line Items]
Change in Fair Value of Plan Asset, Percentage	8.40%	4.30%
Equities - Small Cap
Defined Benefit Plan Disclosure [Line Items]
Change in Fair Value of Plan Asset, Percentage	4.50%	25.30%
Equities - International
Defined Benefit Plan Disclosure [Line Items]
Change in Fair Value of Plan Asset, Percentage	6.30%	4.00%
Equities - Other
Defined Benefit Plan Disclosure [Line Items]
Change in Fair Value of Plan Asset, Percentage	16.00%	8.30%
Fixed Income-Government Securities
Defined Benefit Plan Disclosure [Line Items]
Change in Fair Value of Plan Asset, Percentage	4.00%
Fixed Income-Corporate Bonds
Defined Benefit Plan Disclosure [Line Items]
Change in Fair Value of Plan Asset, Percentage	2.40%
Fixed Income-Mutual Funds
Defined Benefit Plan Disclosure [Line Items]
Change in Fair Value of Plan Asset, Percentage	12.80%
Alternatives/Multi-Asset
Defined Benefit Plan Disclosure [Line Items]
Change in Fair Value of Plan Asset, Percentage	0.90%	8.60%