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Long-Term Debt - Narrative (Details)
3 Months Ended
Feb. 28, 2021
USD ($)
contract
Mar. 01, 2021
USD ($)
Nov. 30, 2020
USD ($)
Structured notes | Jefferies Group      
Debt Instrument [Line Items]      
Debt issued during period, principal amount, net of retirements $ 54,100,000    
Jefferies Group Revolving Credit Facility | Jefferies Group      
Debt Instrument [Line Items]      
Borrowings under credit facility 189,900,000    
Bank loan obligations | Jefferies Group      
Debt Instrument [Line Items]      
Debt principal amount 50,000,000.0    
HomeFed construction loan | HomeFed      
Debt Instrument [Line Items]      
Construction loan, maximum borrowing amount 58,900,000    
Long-term debt 46,600,000   $ 46,200,000
HomeFed construction loan | HomeFed | Subsequent event      
Debt Instrument [Line Items]      
Construction loan, maximum borrowing amount   $ 50,000,000.0  
Vitesse Energy Finance Revolving Credit Facility      
Debt Instrument [Line Items]      
Long-term debt 91,500,000   98,500,000
Maximum borrowing capacity $ 120,000,000.0    
Vitesse Energy Finance Revolving Credit Facility | Minimum      
Debt Instrument [Line Items]      
Percentage of proved reserve value of oil and gas properties 85.00%    
LIBOR | Bank loan obligations | Jefferies Group      
Debt Instrument [Line Items]      
Basis spread on variable rate 1.25%    
LIBOR | HomeFed construction loan | HomeFed      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.15%    
LIBOR | Vitesse Energy Finance Revolving Credit Facility | Vitesse Energy Finance | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 2.50%    
LIBOR | Vitesse Energy Finance Revolving Credit Facility | Vitesse Energy Finance | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.50%    
Line of Credit | Foursight Capital Credit Facilities      
Debt Instrument [Line Items]      
Long-term debt $ 0.0   $ 129,300,000
Line of Credit | Foursight Capital Credit Facilities | Foursight Capital      
Debt Instrument [Line Items]      
Number of warehouse credit commitments | contract 2    
Maximum borrowing capacity $ 175,000,000.0