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Employee Benefit Plans (Tables)
 9 Months Ended
Mar. 31, 2015
Compensation and Retirement Disclosure [Abstract]  
Schedule of net periodic pension expense
​ ​ ​
Three Months
 ​ ​
Nine Months
 ​
For the Periods Ended March 31
 ​ ​
2015
 ​ ​
2014
 ​ ​
2015
 ​ ​
2014
 ​
Service cost – benefits earned during the period
 ​ ​ ​ $ 739 ​ ​ ​ ​ $ 535 ​ ​ ​ ​ $ 2,217 ​ ​ ​ ​ $ 1,843 ​ ​
Interest cost on benefit obligation
 ​ ​ ​ ​ 654 ​ ​ ​ ​ ​ 532 ​ ​ ​ ​ ​ 1,963 ​ ​ ​ ​ ​ 1,750 ​ ​
Expected return on plan assets
 ​ ​ ​ ​ (707) ​ ​ ​ ​ ​ (476) ​ ​ ​ ​ ​ (2,121) ​ ​ ​ ​ ​ (1,751) ​ ​
Amortization of net actuarial loss and prior service costs
 ​ ​ ​ ​ 351 ​ ​ ​ ​ ​ 249 ​ ​ ​ ​ ​ 1,053 ​ ​ ​ ​ ​ 678 ​ ​
Net periodic pension expense
 ​ ​ ​ $ 1,037 ​ ​ ​ ​ $ 840 ​ ​ ​ ​ $ 3,112 ​ ​ ​ ​ $ 2,520 ​ ​
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