Goodwill and Other Intangible Assets - Summary of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Feb. 28, 2014	Nov. 30, 2013
Goodwill [Line Items]
Accumulated amortization - finite lived intangible assets	$ (23,813)	$ (20,533)
Total gross costs - intangible assets	285,550	285,001
Total net carrying amount - intangible assets	261,737	264,090
Impairment losses		(378)
Customer relationships [Member]
Goodwill [Line Items]
Gross costs - finite lived intangible assets	137,119	136,740
Accumulated amortization - finite lived intangible assets	(19,843)	(17,567)
Net carrying amount - finite lived intangible assets	117,276	119,173
Weighted average remaining lives (years)	14 years 7 months 6 days	14 years 9 months 18 days
Impairment losses
Exchange and clearing organization membership interests and registrations [Member]
Goodwill [Line Items]
Accumulated amortization - finite lived intangible assets
Gross costs - indefinite lived intangible assets	14,962	15,294
Net carrying amount - indefinite lived intangible assets	14,962	14,916
Impairment losses		(378)
Trade name [Member]
Goodwill [Line Items]
Gross costs - finite lived intangible assets	133,469	132,967
Accumulated amortization - finite lived intangible assets	(3,970)	(2,966)
Net carrying amount - finite lived intangible assets	129,499	130,001
Weighted average remaining lives (years)	34 years	34 years 3 months 18 days
Impairment losses