Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis Level 3 (Details) $ in Thousands	3 Months Ended
	Jan. 31, 2016 USD ($)
Bank Loans And Other Investments Of Consolidated CLO Entity [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurements with unobservable inputs reconciliation recurring basis asset value, beginning of period (asset)	$ 0
Transfers into Level 3 (asset)	700
Fair value measurements with unobservable inputs reconciliation recurring basis asset value, end of period (asset)	700
Change in unrealized gains (losses) included in net income relating to assets and liabilities held (asset)	0
Senior And Subordinated Note Obligations Of Consolidated CLO Entity [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value measurements with unobservable inputs reconciliation recurring basis liability value, beginning of period (liability)	0
Transfers into Level 3 (liability)	390,654
Fair value measurements with unobservable inputs reconciliation recurring basis liability value, end of period (liability)	390,654
Change in unrealized gains (losses) included in net income relating to assets and liabilities held (liability)	$ 0