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Fair Value Measurements (Tables)
 12 Months Ended
Jun. 30, 2015
Fair Value Disclosures [Abstract]  
Schedule of fair value of derivative instruments based upon pricing models
As of June 30
 ​ ​
2015
 ​ ​
2014
 ​
​ ​ ​
Level 1
 ​ ​
Level 2
 ​ ​
Level 3
 ​ ​
Level 1
 ​ ​
Level 2
 ​ ​
Level 3
 ​
Derivatives
 ​ ​ ​ $ — ​ ​ ​ ​ $ (1,542) ​ ​ ​ ​ $ — ​ ​ ​ ​ $ — ​ ​ ​ ​ $ 386 ​ ​ ​ ​ $ — ​ ​
Deferred consideration on acquisitions
 ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 5,465 ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ — ​ ​ ​ ​ ​ 1,015 ​ ​
Schedule of changes in the fair value of Level 3 assets
​ ​ ​
2015
 ​ ​
2014
 ​
Balance at beginning of period
 ​ ​ ​ $ 1,015 ​ ​ ​ ​ $ 1,725 ​ ​
Changes in estimate
 ​ ​ ​ ​ 216 ​ ​ ​ ​ ​ (403) ​ ​
New items
 ​ ​ ​ ​ 4,769 ​ ​ ​ ​ ​ — ​ ​
Payments ​ ​ ​ ​ (535) ​ ​ ​ ​ ​ (307) ​ ​
Balance at end of period
 ​ ​ ​ $ 5,465 ​ ​ ​ ​ $ 1,015 ​ ​
​