Derivative Instruments (Outstanding Foreign Currency Forward Contracts) (Details) (USD $) In Thousands, unless otherwise specified	Feb. 28, 2013	Nov. 30, 2012
Derivative [Line Items]
Total, Notional Value	$ 28,359	$ 37,918
Total, Fair Value	34	(186)
Forward contracts to sell U.S. dollars [Member]
Derivative [Line Items]
Foreign currency derivative contracts to sell U.S. dollars, Notional Value	8,255	6,453
Foreign currency derivative contracts to purchase U.S. dollars, Fair Value	(8)	4
Forward contracts to purchase U.S. dollars [Member]
Derivative [Line Items]
Foreign currency derivative contracts to purchase U.S. dollars, Notional Value	20,104	31,465
Foreign currency derivative contracts to purchase U.S. dollars, Fair Value	$ 42	$ (190)