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Employee Benefit Plans - Significant actuarial assumptions for plan (Details)
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Employee Benefit Plans      
Discount rate for interest cost 2.20% 2.20% 3.10%
Expected rate of return on plan assets 4.40% 4.90% 4.90%
Discount rate for year-end benefit obligation 2.90% 2.80% 3.60%