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Financial Instruments and Risk Management (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2018 | Nov. 30, 2017 | Aug. 31, 2017 | May 31, 2017 | Feb. 28, 2017 | Nov. 30, 2016 | Aug. 31, 2016 | May 31, 2016 | Feb. 28, 2018 | Feb. 28, 2017 | Feb. 29, 2016
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |  |  |  |  |  |  |  |  |
Charge from re-measurement of monetary assets and liabilities due to an exchange rate change |  |  |  |  |  |  |  |  |  |  | $ 9,570
Currency Exchange Uncertainties |  |  |  |  |  |  |  |  |  |  |
Sales revenue, net | $ 390,847 | $ 423,709 | $ 347,205 | $ 327,986 | $ 347,369 | $ 412,251 | $ 335,058 | $ 311,998 | $ 1,489,747 | $ 1,406,676 | 1,392,575
Operating income (loss) |  |  |  |  |  |  |  |  | 169,062 | $ 169,664 | 116,294
SG&A |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |  |  |  |  |  |  |  |  |
Net foreign exchange gains (losses), including the impact of currency hedges and currency swaps |  |  |  |  |  |  |  |  | $ (3,100) |  | $ (3,100)
Net sales revenue | Geographic concentration | International operations - transactions denominated in foreign currencies |  |  |  |  |  |  |  |  |  |  |
Foreign Currency Risk and Currency Exchange Uncertainties |  |  |  |  |  |  |  |  |  |  |
Concentration risk percentage |  |  |  |  |  |  |  |  | 13.00% | 13.00% | 16.00%

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