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Employee Benefit Plans - Significant actuarial assumptions for plan (Details 3)
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Defined Benefit Plan Disclosure [Line Items]      
Discount rate for service and interest 4.50% 5.00% 4.40%
Expected rate of return on plan assets 6.70% 7.00% 7.50%
Discount rate for year-end benefit obligation 4.60% 4.50% 5.00%
Minimum      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase 3.00% 3.00% 3.00%
Maximum      
Defined Benefit Plan Disclosure [Line Items]      
Rate of compensation increase 3.75% 4.50% 4.50%