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Employee Benefit Plans - Significant actuarial assumptions for plan (Details 3)
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]      
Discount rate for service cost   4.00% 4.60%
Discount rate for interest cost 3.90% 3.20% 4.60%
Expected rate of return on plan assets 5.60% 6.10% 6.10%
Discount rate for year-end benefit obligation 4.20% 3.90% 3.90%