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Fiancial Instruments and Risk Management - Derivative tax effect (Details) - USD ($) $ in Thousands | 3 Months Ended
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May 31, 2017 | May 31, 2016
Pre-tax effect of derivative instruments |  |
Gain/ (Loss) Recognized in OCI (effective portion) | $ (2,245) | $ (1,019)
Gain/ (Loss) Reclassified from Accumulated Other Comprehensive Income (Loss) into Income | 302 | (158)
Gain/ (Loss) Recognized as Income | (549) | $ 52
Foreign currency contracts | Cash flow hedges |  |
Pre-tax effect of derivative instruments |  |
Net gains currently reported in accumulated other comprehensive income, to be reclassified into income | $ 1,100 |
Net gains currently reported in accumulated other comprehensive income, to be reclassified into income, period of time to transfer | 12 months |

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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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