Non-Controlling and Other Beneficial Interests (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2013
Apr. 30, 2012
Non Controlling And Other Beneficial Interests Details [Abstract]        
Consolidated sponsored funds $ (2,986) $ (1,182) $ (4,092) $ (2,328)
Majority-owned subsidiaries (3,690) (3,751) (7,589) (7,111)
Non-controlling interest value adjustments (666) (1,097) (11,313) (9,199)
Consolidated CLO entity (97) (3,870) 3,233 (8,861)
Net income attributable to non-controlling and other beneficial interests $ (7,439) $ (9,900) $ (19,761) $ (27,499)