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Financial Instruments and Risk Management (Details) $ in Thousands | 1 Months Ended | 3 Months Ended
--- | --- | ---
Feb. 28, 2013 VEF / $ | May. 31, 2015 USD ($) VEF / $ | May. 31, 2014 USD ($) VEF / $
SG&A |  |  |
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps | $ |  | $ (880) | $ (30)
Income Tax Expense (Benefit) [Member] |  |  |
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps | $ |  | $ 140 | $ 40
Venezuelan Bolivar |  |  |
Currency Exchange Uncertainties |  |  |
Value of foreign currency before devaluation (in Bolivars per dollar) | 4.30 |  |
Value of foreign currency after devaluation (in Bolivars per dollar) | 6.30 |  |
Foreign currency exchange rate ( in foreign currency per dollar) |  | 6.30 |
Venezuelan Bolivar | SICAD 1 |  |  |
Currency Exchange Uncertainties |  |  |
Foreign currency exchange rate ( in foreign currency per dollar) |  |  | 12
Venezuelan Bolivar | SIMADI Foreign Exchange Mechanism [Member] |  |  |
Currency Exchange Uncertainties |  |  |
Foreign currency exchange rate ( in foreign currency per dollar) |  | 199 |
Geographic concentration | Venezuela |  |  |
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |
Percentage of net sales |  | 1.20% | 0.60%
Currency Exchange Uncertainties |  |  |
Net investment | $ |  | $ 11,600 |
Net sales revenue | Geographic concentration | International operations - transactions denominated in foreign currencies |  |  |
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |
Percentage of net sales |  | 14.00% | 15.00%

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