Segment Reporting (Details 1) (USD $) In Thousands	Aug. 31, 2011	Nov. 30, 2010	Aug. 31, 2010
Total assets by segment
Segment assets	$ 45,125,243	$ 36,726,543	$ 32,672,100
Capital Markets [Member]
Total assets by segment
Segment assets	45,080,900		32,539,500
Asset Management [Member]
Total assets by segment
Segment assets	$ 44,300		$ 132,600