Derivative Instruments (Outstanding Foreign Currency Forward Contracts) (Details) - USD ($) $ in Thousands	Aug. 31, 2015	Nov. 30, 2014
Derivative [Line Items]
Derivative contracts, notional value	$ 95,996	$ 37,272
Derivative contracts, fair value	(3,452)	(102)
Forward contracts to sell U.S. dollars [Member]
Derivative [Line Items]
Derivative contracts, notional value	88,030	21,738
Derivative contracts, fair value	(3,389)	(13)
Forward contracts to purchase U.S. dollars [Member]
Derivative [Line Items]
Derivative contracts, notional value	7,966	15,534
Derivative contracts, fair value	$ (63)	$ (89)

Fair value of the assets less the liabilities of a derivative or group of derivatives.

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