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Long-Term Debt - Narrative (Details) - USD ($)
12 Months Ended
Nov. 30, 2022
Nov. 30, 2021
Debt Instrument [Line Items]    
Increase (decrease) of long-term debt $ (351,700,000) $ 774,000,000
Long-term debt 8,774,086,000 9,125,745,000 [1]
Unsecured long-term debt    
Debt Instrument [Line Items]    
Increase (decrease) of long-term debt   349,000,000
Long-term debt 7,474,530,000 8,002,852,000
Secured long-term debt    
Debt Instrument [Line Items]    
Increase (decrease) of long-term debt 176,700,000 484,300,000
Long-term debt 100,000,000 100,000,000
Secured long-term debt | Secured Credit Facilities    
Debt Instrument [Line Items]    
Long-term debt 933,531,000 $ 774,180,000
Long-term debt gross 112,900,000  
2.625% Senior Debentures (1) | Senior notes    
Debt Instrument [Line Items]    
Interest rate   2.625%
Debt principal amount   $ 1,000,000,000
Floating Rate Senior Notes, due October 29, 2071 | Senior notes    
Debt Instrument [Line Items]    
Debt principal amount   $ 62,300,000
5.125% Senior Notes, due January 20, 2023    
Debt Instrument [Line Items]    
Interest rate   5.125%
5.125% Senior Notes, due January 20, 2023 | Senior notes    
Debt Instrument [Line Items]    
Debt principal amount   $ 750,000,000
5.500% Senior Notes    
Debt Instrument [Line Items]    
Interest rate   5.50%
Debt principal amount   $ 308,300,000
5.500% Senior Notes | Unsecured long-term debt    
Debt Instrument [Line Items]    
Long-term debt 393,048,000 440,120,000
Structured notes    
Debt Instrument [Line Items]    
Debt issued during period, principal amount, net of retirements 209,400,000 175,600,000
Structured notes | Unsecured long-term debt    
Debt Instrument [Line Items]    
Long-term debt 1,583,828,000 1,843,598,000
Secured Credit Facilities    
Debt Instrument [Line Items]    
Long-term debt   774,100,000
Loans | Subsidiaries    
Debt Instrument [Line Items]    
Long-term debt $ 100,000,000  
Bank Loan Obligations | LIBOR    
Debt Instrument [Line Items]    
Debt basis spread on variable rate 1.25%  
HomeFed Construction Loans | HomeFed LLC    
Debt Instrument [Line Items]    
Construction loans, maximum borrowing amount $ 101,900,000  
Weighted average interest rate 6.07%  
Long-term debt gross $ 57,000,000 $ 45,600,000
HomeFed Construction Loans | LIBOR | HomeFed LLC | Minimum    
Debt Instrument [Line Items]    
Debt basis spread on variable rate 1.35%  
HomeFed Construction Loans | LIBOR | HomeFed LLC | Maximum    
Debt Instrument [Line Items]    
Debt basis spread on variable rate 3.00%  
[1] See Note 1 for a description of financial statement presentation changes made as a result of our Merger with Jefferies Group.