Derivative Instruments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2014
Derivative [Line Items]
Derivative liabilities	$ 6,616	$ 4,021
Forward Contracts [Member]
Derivative [Line Items]
Minimum maturity period, foreign currency derivative	30 days
Maximum maturity period, foreign currency derivative	366 days
Gains (losses) on foreign currency option contracts	$ 4,000	4,600	$ 1,500
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative liabilities	$ 6,600
Other Accrued Liabilities [Member]
Derivative [Line Items]
Derivative liabilities		$ 4,000