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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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- Definition

Charge from re-measurement of monetary assets and liabilities due to an exchange rate change.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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-Publisher FASB
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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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The net result for the period of deducting operating expenses from operating revenues.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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