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Derivatives (Tables)
 6 Months Ended
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of outstanding derivatives designated and effective as cash flow hedges
​ ​ ​ ​ ​ ​
Notional 
Amount at 
December 31, 
2015
 ​ ​
Fair value as of
 ​
Instrument
 ​ ​
Hedge
 ​ ​
December 31,
2015
 ​ ​
June 30,
2015
 ​
Options
 ​ ​
Brazilian Real calls
 ​ ​
R$156,000
 ​ ​ ​ $ 675 ​ ​ ​ ​ $ 493 ​ ​
Options
 ​ ​
Brazilian Real puts
 ​ ​
R$156,000
 ​ ​ ​ $ (5,211) ​ ​ ​ ​ $ (2,035) ​ ​