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Derivatives (Tables)
 6 Months Ended
Dec. 31, 2014
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of outstanding derivatives designated and effective as cash flow hedges
Instrument
 ​ ​
Hedge
 ​ ​
Notional
Amount at
December 31,
2014
 ​ ​
Fair value as of
 ​
​
December 31, 
2014
 ​ ​
June 30,
2014
 ​
Options
 ​ ​
Brazilian Real calls
 ​ ​ ​ R$ 117,000 ​ ​ ​ ​ $ 385 ​ ​ ​ ​ $ 432 ​ ​
Options
 ​ ​
Brazilian Real puts
 ​ ​ ​ (R$ 117,000) ​ ​ ​ ​ $ (722) ​ ​ ​ ​ $ (46)