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Derivative Instruments (Outstanding Foreign Currency Forward Contracts) (Details) - USD ($) $ in Thousands | May 31, 2016 | Nov. 30, 2015
--- | --- | ---
Derivative [Line Items] |  |
Derivative contracts, notional value | $ 90,642 | $ 78,825
Derivative contracts, fair value | (3,649) | (4,021)
Short [Member] | Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Derivative contracts, notional value | 87,259 | 76,748
Derivative contracts, fair value | (3,644) | (4,026)
Long [Member] | Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Derivative contracts, notional value | 3,383 | 2,077
Derivative contracts, fair value | $ (5) | $ 5

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