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Financial Instruments and Risk Management (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 29, 2016 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 29, 2016 | Nov. 30, 2015 | Aug. 31, 2015 | May 31, 2015 | Feb. 28, 2017 | Feb. 29, 2016 | Feb. 28, 2015
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  |  | 44.00% | 44.00% |
Currency Exchange Uncertainties |  |  |  |  |  |  |  |  |  |  |  |
Sales revenue, net |  | $ 376,697 | $ 444,414 | $ 368,170 | $ 347,938 | $ 385,724 | $ 445,503 | $ 369,129 | $ 345,345 | $ 1,537,219 | $ 1,545,701 | $ 1,445,131
Operating income |  |  |  |  |  |  |  |  |  | 164,332 | 130,615 | 161,719
SG&A |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |  |  |  |  |  |  |  |  |  |
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps |  |  |  |  |  |  |  |  |  | $ 500 | $ (3,100) | $ (5,700)
Venezuela |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |  |  |  |  |  |  |  |  |  |
Charge from re-measurement of monetary assets and liabilities due to an exchange rate change | $ 9,570 |  |  |  |  |  |  |  |  |  |  |
Net sales revenue | Geographic concentration | International operations - transactions denominated in foreign currencies |  |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  |  | 12.00% | 14.00% | 14.00%

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