Income Taxes Deferred Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
Oct. 31, 2011
Oct. 31, 2010
Deferred tax assets:    
Closed-end fund expenses $ 0 $ 94,678
Stock-based compensation 67,190 60,873
Differences between book and tax bases of investments 5,763 5,334
Deferred rent 4,874 5,105
Federal benefit of unrecognized state tax benefits 3,554 3,489
Compensation and benefit expense 3,077 3,145
Capital loss carry-forward 0 1,288
Unrealized losses on derivative instruments 929 1,086
Other 403 695
Total deferred tax asset 85,790 175,693
Deferred tax liabiliites    
Closed-end fund expenses 0 (21,542)
Compensation and benefit expense (10,909) (15,424)
Deferred sales commissions (10,624) (18,263)
Differences between book and tax bases of goodwill and intangibles (16,075) (16,505)
Differences between book and tax bases of property (4,966) (5,718)
Unrealized net holding gains on investments (1,873) (967)
Total deferred tax liability (44,447) (78,419)
Net deferred tax asset $ 41,343 $ 97,274