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Employee Benefit Plans (Tables)
9 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of net periodic pension expense
     
Three Months
   
Nine months
 
For the Periods Ended March 31
   
2017
   
2016
   
2017
   
2016
 
Service cost – benefits earned during the period
      $         $ 735         $ 845         $ 2,204    
Interest cost on benefit obligation
        498           723           1,546           2,170    
Expected return on plan assets
        (834)           (794)           (2,540)           (2,382)    
Amortization of net actuarial (gain) loss and prior service 
costs
        111           446           563           1,338    
Settlement cost
                            1,702              
Net periodic pension expense
      $ (225)         $ 1,110         $ 2,116         $ 3,330