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Incentive Plans - Equity Incentive Plan Policy Valuation Assumptions (Details) - Equity Incentive Plans - Stock Options
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected volatility 0.00% 16.50%
Weighted-average volatility 0.00% 16.50%
Expected dividend yield 0.00% 2.80%
Expected term (in years) 0 years 7 years 6 months
Risk-free interest rate 0.00% 2.10%