Derivative Instruments (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Derivative [Line Items]
Derivative liabilities	$ 27	$ 6,616
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	$ 9,400	4,000	$ 4,600
Other Noncurrent Liabilities [Member]
Derivative [Line Items]
Derivative liabilities	$ 200	200
Other Accrued Liabilities [Member]
Derivative [Line Items]
Derivative liabilities		$ 6,600