v3.26.1
Fair Value Disclosures - Quantitative Information about Significant Unobservable Inputs Used in Level 3 Fair Value Measurements (Details)
 6 Months Ended 12 Months Ended
May 31, 2026
USD ($)
$ / shares
Nov. 30, 2025
USD ($)
$ / shares
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liability | $ $ 1,614,429,000 $ 1,490,017,000
Other secured financings | $ 415,801,000 425,964,000
Long-term debt | $ 3,860,273,000 3,734,843,000
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liability | $ 22,223,000 45,953,000
Other secured financings | $ 10,076,000 13,454,000
Long-term debt | $ 1,070,114,000 1,063,358,000
Level 3 | Non-exchange-traded securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned | $ 255,866,000 218,853,000
Level 3 | Corporate debt securities    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned | $ 54,811,000 37,578,000
Derivative liability | $   $ 3,720,000
Level 3 | Corporate debt securities | Estimated recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input   0.30
Financial instruments sold, not yet purchased, measurement input   0.30
Level 3 | CDOs and CLOs    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned | $ $ 51,753,000 $ 25,824,000
Level 3 | CDOs and CLOs | Constant prepayment rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input   0.20
Level 3 | CDOs and CLOs | Constant default rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.02 0.02
Level 3 | CDOs and CLOs | Loss severity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.30 0.30
Level 3 | CDOs and CLOs | Discount rate/yield    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input   0.17
Level 3 | Residential mortgage-backed securities | Discounted Cash Flow    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned | $ $ 5,376,000 $ 6,663,000
Level 3 | Residential mortgage-backed securities | Constant prepayment rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.10 0.12
Level 3 | Residential mortgage-backed securities | Constant default rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.005 0.003
Level 3 | Residential mortgage-backed securities | Loss severity    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.45 0.20
Level 3 | Residential mortgage-backed securities | Discount rate/yield    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.20 0.15
Level 3 | Other ABS | Discounted Cash Flows, Market Approach, Scenario Analysis    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned | $ $ 185,232,000 $ 129,693,000
Level 3 | Other ABS | Estimated recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input   0.66
Level 3 | Loans and other receivables    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned | $ 90,322,000 $ 127,720,000
Level 3 | Investments at fair value | Market Approach    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned | $ $ 168,327,000 $ 157,162,000
Level 3 | Private equity securities | Discount rate/yield    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.28 0.28
Level 3 | Private equity securities | Estimated revenue    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input | $ 30,087,431 29,818,082
Level 3 | Equity options    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liability | $ $ 6,224,000 $ 6,094,000
Level 3 | Equity options | Volatility    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative asset, measurement input   0.34
Level 3 | Loans    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liability | $   $ 9,757,000
Level 3 | Loans | Estimated recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments sold, not yet purchased, measurement input   0.30
Level 3 | Long-term debt    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Long-term debt | $ $ 1,070,114,000 $ 1,063,358,000
Minimum | Level 3 | Non-exchange-traded securities | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0 0
Minimum | Level 3 | Non-exchange-traded securities | Volatility    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.31 0.44
Minimum | Level 3 | Corporate debt securities | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 67 49
Minimum | Level 3 | Corporate debt securities | Discount rate/yield    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.25 0.18
Minimum | Level 3 | CDOs and CLOs | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 100 98
Minimum | Level 3 | CDOs and CLOs | Constant prepayment rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.15  
Minimum | Level 3 | CDOs and CLOs | Discount rate/yield    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.12  
Minimum | Level 3 | Other ABS | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 117 116
Minimum | Level 3 | Other ABS | Discount rate/yield    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.155 0.155
Minimum | Level 3 | Other ABS | Cumulative loss rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.162 0.160
Minimum | Level 3 | Other ABS | Duration (years)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input, term 1 year 1 month 6 days 1 year 1 month 6 days
Minimum | Level 3 | Other ABS | Estimated recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.56  
Minimum | Level 3 | Loans and other receivables | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 8 67
Minimum | Level 3 | Loans and other receivables | Estimated recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.07 0.08
Minimum | Level 3 | Interest rate swaps | Basis points upfront    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative asset, measurement input 0.2  
Derivative liability, measurement input 6.9  
Minimum | Level 3 | Private equity securities | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0 0
Minimum | Level 3 | Equity options | Volatility    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liability, measurement input 0.53 0.34
Minimum | Level 3 | Embedded options | Basis points upfront    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative asset, measurement input   0.4
Derivative liability, measurement input   0.0
Minimum | Level 3 | Loans | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments sold, not yet purchased, measurement input   100
Minimum | Level 3 | Other secured financings: | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Other secured financings, measurement input 117 114
Minimum | Level 3 | Other secured financings: | Estimated recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Other secured financings, measurement input 0.74 0.74
Minimum | Level 3 | Long-term debt | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Long-term debt, measurement input 64 72
Maximum | Level 3 | Non-exchange-traded securities | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 486 486
Maximum | Level 3 | Non-exchange-traded securities | Volatility    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input   0.48
Maximum | Level 3 | Corporate debt securities | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 124 121
Maximum | Level 3 | Corporate debt securities | Discount rate/yield    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.30 0.20
Maximum | Level 3 | CDOs and CLOs | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 117 100
Maximum | Level 3 | CDOs and CLOs | Constant prepayment rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.20  
Maximum | Level 3 | CDOs and CLOs | Discount rate/yield    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.16  
Maximum | Level 3 | Other ABS | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 135 133
Maximum | Level 3 | Other ABS | Discount rate/yield    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.161 0.157
Maximum | Level 3 | Other ABS | Cumulative loss rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.171 0.164
Maximum | Level 3 | Other ABS | Duration (years)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input, term 1 year 2 months 12 days 1 year 2 months 12 days
Maximum | Level 3 | Other ABS | Estimated recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.58  
Maximum | Level 3 | Loans and other receivables | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 117 129
Maximum | Level 3 | Loans and other receivables | Estimated recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 1 1
Maximum | Level 3 | Interest rate swaps | Basis points upfront    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liability, measurement input 22.2  
Maximum | Level 3 | Private equity securities | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 170,363 27,989
Maximum | Level 3 | Equity options | Volatility    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liability, measurement input   0.61
Maximum | Level 3 | Embedded options | Basis points upfront    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative asset, measurement input   0.5
Derivative liability, measurement input   21.0
Maximum | Level 3 | Loans | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments sold, not yet purchased, measurement input   129
Maximum | Level 3 | Other secured financings: | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Other secured financings, measurement input 118 117
Maximum | Level 3 | Other secured financings: | Estimated recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Other secured financings, measurement input 1 1
Maximum | Level 3 | Long-term debt | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Long-term debt, measurement input 120 120
Weighted Average | Level 3 | Non-exchange-traded securities | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 81 85
Weighted Average | Level 3 | Non-exchange-traded securities | Volatility    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0 0.47
Weighted Average | Level 3 | Corporate debt securities | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 92 72
Weighted Average | Level 3 | Corporate debt securities | Discount rate/yield    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.26 0.19
Weighted Average | Level 3 | CDOs and CLOs | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 105 99
Weighted Average | Level 3 | CDOs and CLOs | Constant prepayment rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.18  
Weighted Average | Level 3 | CDOs and CLOs | Discount rate/yield    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.14  
Weighted Average | Level 3 | Other ABS | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 130 130
Weighted Average | Level 3 | Other ABS | Discount rate/yield    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.159 0.156
Weighted Average | Level 3 | Other ABS | Cumulative loss rate    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.166 0.162
Weighted Average | Level 3 | Other ABS | Duration (years)    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input, term 1 year 2 months 12 days 1 year 1 month 6 days
Weighted Average | Level 3 | Other ABS | Estimated recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.57  
Weighted Average | Level 3 | Loans and other receivables | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 103 97
Weighted Average | Level 3 | Loans and other receivables | Estimated recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 0.76 0.35
Weighted Average | Level 3 | Interest rate swaps | Basis points upfront    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative asset, measurement input 0  
Derivative liability, measurement input 13.9  
Weighted Average | Level 3 | Private equity securities | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments owned, measurement input 7,711 2,722
Weighted Average | Level 3 | Equity options | Volatility    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative liability, measurement input 0 0.58
Weighted Average | Level 3 | Embedded options | Basis points upfront    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Derivative asset, measurement input   0.5
Derivative liability, measurement input   13.3
Weighted Average | Level 3 | Loans | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Financial instruments sold, not yet purchased, measurement input   117
Weighted Average | Level 3 | Other secured financings: | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Other secured financings, measurement input 118 115
Weighted Average | Level 3 | Other secured financings: | Estimated recovery percentage    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Other secured financings, measurement input 0.96 0.96
Weighted Average | Level 3 | Long-term debt | Price    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Long-term debt, measurement input 99 101