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Employee Benefit Plans - Significant actuarial assumptions for plan (Details 3)
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract]      
Discount rate for service cost 4.00% 4.60% 4.50%
Discount rate for interest cost 3.20% 4.60% 4.50%
Expected rate of return on plan assets 6.10% 6.10% 6.70%
Discount rate for year-end benefit obligation 3.90% 3.90% 4.60%