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Incentive Plans - Equity Incentive Plan Policy Valuation Assumptions (Details) - Equity Incentive Plans - Stock Option
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected volatility 20.30% 20.30%
Weighted-average volatility 20.30% 20.30%
Expected dividend yield 3.90% 3.40%
Expected term (in years) 7 years 3 months 18 days 7 years 4 months 24 days
Risk-free interest rate 2.90% 1.40%