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Derivative Instruments (Outstanding Foreign Currency Forward Contracts) (Details) - USD ($) $ in Thousands | May. 31, 2015 | Nov. 30, 2014
--- | --- | ---
Derivative [Line Items] |  |
Derivative contracts, notional value | $ 93,727 | $ 37,272
Derivative contracts, fair value | (2,449) | (102)
Forward contracts to sell U.S. dollars [Member] |  |
Derivative [Line Items] |  |
Derivative contracts, notional value | 83,747 | 21,738
Derivative contracts, fair value | (2,455) | (13)
Forward contracts to purchase U.S. dollars [Member] |  |
Derivative [Line Items] |  |
Derivative contracts, notional value | 9,980 | 15,534
Derivative contracts, fair value | $ 6 | $ (89)

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