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Fair Value Measurements (Tables)
 6 Months Ended
Dec. 31, 2014
Fair Value Disclosures [Abstract]  
Schedule of the fair values of the senior notes
As of
 ​ ​
December 31,
2014
 ​ ​
June 30,
2014
 ​
Fair values ​ ​ ​
Term B Loan
 ​ ​ ​ $ 283,500 ​ ​ ​ ​ $ 289,638 ​ ​