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Operating and Reporting Segments (Disclosure of Facilities) (Details) - Financial Services - USD ($)
6 Months Ended
May 31, 2020
Nov. 30, 2019
Line of Credit Facility [Line Items]    
Collateral under facilities $ 1,085,503,000 $ 1,423,650,000
Warehouse Repurchase Facility    
Line of Credit Facility [Line Items]    
Facility, term 364 days  
Maximum Aggregate Commitment $ 2,500,000,000  
Borrowings under facility 1,054,588,000 1,374,063,000
Residential Facilities Maturing June 2020 | Warehouse Repurchase Facility    
Line of Credit Facility [Line Items]    
Maximum Aggregate Commitment 500,000,000  
Residential Facilities Maturing in July 2020 | Warehouse Repurchase Facility    
Line of Credit Facility [Line Items]    
Maximum Aggregate Commitment 300,000,000  
Residential Facilities Maturing in January 2021 | Warehouse Repurchase Facility    
Line of Credit Facility [Line Items]    
Maximum Aggregate Commitment 500,000,000  
Residential Facilities Due in March 2021 | Warehouse Repurchase Facility    
Line of Credit Facility [Line Items]    
Maximum Aggregate Commitment 300,000,000  
Residential facilities | Warehouse Repurchase Facility    
Line of Credit Facility [Line Items]    
Maximum Aggregate Commitment 1,600,000,000  
Commercial facilities maturing November 2020 | Warehouse Repurchase Facility    
Line of Credit Facility [Line Items]    
Maximum Aggregate Commitment 200,000,000  
Commercial Warehouse Repurchase Facility Due in December 2020 | Warehouse Repurchase Facility    
Line of Credit Facility [Line Items]    
Maximum Aggregate Commitment 700,000,000  
Commercial facilities | Warehouse Repurchase Facility    
Line of Credit Facility [Line Items]    
Maximum Aggregate Commitment 900,000,000  
Commercial Facilities, Used to Finance Origination of Accrual Loans | Warehouse Repurchase Facility    
Line of Credit Facility [Line Items]    
Maximum Aggregate Commitment 50,000,000.0  
Borrowings under facility 11,400,000  
Warehouse Repurchase Facility    
Line of Credit Facility [Line Items]    
Borrowings under facilities $ 227,003,000 $ 216,870,000