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Derivatives (Tables)
 3 Months Ended
Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of outstanding derivatives designated and effective as cash flow hedges
​
​ ​ ​ ​ ​ ​
Notional
Amount at
September 30,
2015
 ​ ​
Fair value as of
 ​
Instrument
 ​ ​
Hedge
 ​ ​
September 30,
2015
 ​ ​
June 30,
2015
 ​
Options
 ​ ​
Brazilian Real calls
 ​ ​
R$156,000
 ​ ​ ​ $ 564 ​ ​ ​ ​ $ 493 ​ ​
Options
 ​ ​
Brazilian Real puts
 ​ ​
R$(156,000)
 ​ ​ ​ ​ (7,009) ​ ​ ​ ​ ​ (2,035) ​ ​