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Employee Benefit Plans (Tables)
9 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of net periodic pension expense
 
     
Three Months
   
Nine Months
 
For the Periods Ended March 31
   
2016
   
2015
   
2016
   
2015
 
Service cost – benefits earned during the period
      $ 735         $ 739         $ 2,204         $ 2,217    
Interest cost on benefit obligation
        723           654           2,170           1,963    
Expected return on plan assets
        (794)           (707)           (2,382)           (2,121)    
Amortization of net actuarial (gain) loss and prior service costs
        446           351           1,338           1,053    
Net periodic pension expense
      $ 1,110         $ 1,037         $ 3,330         $ 3,112