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Employee Benefit Plans - Significant actuarial assumptions for plan (Details 3)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]      
Discount rate for service cost     4.00%
Discount rate for interest cost 3.10% 3.90% 3.20%
Expected rate of return on plan assets 4.90% 5.60% 6.10%
Discount rate for year-end benefit obligation 3.60% 4.20% 3.90%