Goodwill and Other Intangible Assets - Goodwill (Detail) $ in Thousands	9 Months Ended
	Aug. 31, 2017 USD ($)
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 1,640,653
Translation adjustments	2,745
Goodwill, Ending Balance	1,643,398
Capital Markets
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1,637,653
Goodwill, Ending Balance	1,640,398
Asset Management
Goodwill [Roll Forward]
Goodwill, Beginning Balance	3,000
Goodwill, Ending Balance	3,000
Investment Banking, Equities, and Fixed Income
Goodwill [Roll Forward]
Goodwill, Ending Balance	$ 1,640,400