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Derivatives (Tables)
 12 Months Ended
Jun. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Schedule of significant outstanding derivatives employed to manage market risk and designated as cash flow hedges
Instrument
 ​ ​
Hedge
 ​ ​
Notional
amount at
June 30, 2015
 ​ ​
Fair value as of June 30,
 ​
​
2015
 ​ ​
2014
 ​
Options
 ​ ​
Brazilian Real calls
 ​ ​
R$ 136,500
 ​ ​ ​ $ 493 ​ ​ ​ ​ $ 432 ​ ​
Options
 ​ ​
Brazilian Real puts
 ​ ​
(R$ 136,500)
 ​ ​ ​ ​ (2,035) ​ ​ ​ ​ ​ (46)