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Stock Option Plan (Tables)
 12 Months Ended
Jun. 30, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of weighted-average grant-date fair value of the options
Options
 ​ ​
Shares
 ​ ​
Weighted-
Average
Exercise Price
Per Share
 ​
Outstanding, June 30, 2014
 ​ ​ ​ ​ 1,498,380 ​ ​ ​ ​ $ 11.83 ​ ​
Granted
 ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​
Exercised
 ​ ​ ​ ​ (112,840) ​ ​ ​ ​ $ 11.83 ​ ​
Forfeited or expired
 ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​
Outstanding, June 30, 2015
 ​ ​ ​ ​ 1,385,540 ​ ​ ​ ​ $ 11.83 ​ ​
Exercisable, June 30, 2015
 ​ ​ ​ ​ 1,385,540 ​ ​ ​ ​ $ 11.83
Schedule of the assumptions included in the Black-Scholes model
​ ​ ​
2013
 ​
Risk-free rate of return
 ​ ​
2.70%
 ​
Expected life
 ​ ​
3.0 to 7.5 years
 ​
Expected volatility
 ​ ​
35%−50%
 ​
Expected dividend yield
 ​ ​
0.00%
 ​