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Fair Value Measurements (Tables)
 9 Months Ended
Mar. 31, 2017
Fair Value Disclosures [Abstract]  
Schedule of fair value derivatives, assets and liabilities
As of
 ​ ​
March 31, 2017
 ​ ​
June 30, 2016
 ​
​ ​ ​
Level 1
 ​ ​
Level 2
 ​ ​
Level 3
 ​ ​
Level 1
 ​ ​
Level 2
 ​ ​
Level 3
 ​
Derivatives asset
 ​ ​ ​ $  — ​ ​ ​ ​ $ 3,717 ​ ​ ​ ​ $ — ​ ​ ​ ​ $  — ​ ​ ​ ​ $ 2,655 ​ ​ ​ ​ $ — ​ ​
Deferred contingent consideration on 
acquisitions
 ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ (7,989) ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ (6,745) ​ ​
 
Schedule of changes in the fair value of Level 3 assets
 
Balance, June 30, 2016
       $ (6,745)    
 
Acquisition-related accrued interest
         (1,314)    
 
Payment
         70    
 
Balance, March 31, 2017
       $ (7,989)