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Fair Value of Assets and Liabilities Measured at Fair Value on a Recurring Basis Level 3 (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Apr. 30, 2016
Apr. 30, 2016
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) $ 700 $ 0
Net gains (losses) on investments and note obligations included in net income (40) (40)
Transfers into Level 3 (asset)   700
Fair value measurements with unobservable inputs reconciliation recurring basis asset value, end of period (asset) 660 660
Change in unrealized gains (losses) included in net income relating to assets and liabilities held (asset) (40) (40)
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) 390,654 0
Net gains (losses) on investments and note obligations included in net income (6,430) (6,430)
Transfers into Level 3 (liability)   390,654
Fair value measurements with unobservable inputs reconciliation recurring basis liability value, end of period (liability) 384,224 384,224
Change in unrealized gains (losses) included in net income relating to assets and liabilities held (liability) $ (6,430) $ (6,430)