Goodwill and Other Intangible Assets - Goodwill (Detail) $ in Thousands	9 Months Ended
	Aug. 31, 2016 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 1,656,588
Translation adjustments	(11,295)
Goodwill, Ending Balance	1,645,293
Investment Banking, Equities, and Fixed Income [Member]
Goodwill [Roll Forward]
Goodwill, Ending Balance	1,642,300
Capital Markets [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1,653,588
Goodwill, Ending Balance	1,642,293
Asset Management Income [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	3,000
Goodwill, Ending Balance	$ 3,000