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Derivative Instruments (Narrative) (Details) - Forward Contracts [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Aug. 31, 2015 | Aug. 31, 2014 | Aug. 31, 2015 | Aug. 31, 2014
Derivative [Line Items] |  |  |  |
Minimum maturity period, foreign currency derivative |  |  | 90 days |
Maximum maturity period, foreign currency derivative |  |  | 2 years |
Gains (losses) on foreign currency forward contracts | $ 0.6 | $ (0.4) | $ (1.9) | $ (1.5)

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Maximum amount of time remaining before foreign currency exchange rate derivatives mature or expire, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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