Derivative Instruments (Outstanding Foreign Currency Forward Contracts) (Details) - USD ($) $ in Thousands	Aug. 31, 2017	Nov. 30, 2016
Derivative [Line Items]
Derivative contracts, notional value	$ 117,719	$ 76,363
Derivative contracts, fair value	(3,540)	(6,616)
Forward Contracts To Sell U.S. Dollars [Member]
Derivative [Line Items]
Derivative contracts, notional value	117,499	74,690
Derivative contracts, fair value	(3,539)	(6,597)
Forward Contracts To Purchase U.S. Dollars [Member]
Derivative [Line Items]
Derivative contracts, notional value	220	1,673
Derivative contracts, fair value	$ (1)	$ (19)

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant