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Operating and Reporting Segments (Narrative) (Details)
6 Months Ended
May 31, 2020
USD ($)
transaction
May 31, 2019
USD ($)
transaction
Nov. 30, 2019
USD ($)
Segment Reporting Information [Line Items]      
Originated loans sold into a securitization trust not settled $ 146,400,000 $ 61,000,000.0  
Origination of loans receivable, held-for-sale   705,300,000  
Investments held-to-maturity 164,982,000   $ 244,406,000
Financial Services      
Segment Reporting Information [Line Items]      
Origination of loans receivable 417,700,000 720,600,000  
Sale of loans held-for-sale $ 457,400,000 $ 500,500,000  
Number of securitization transactions | transaction 3 5  
Commercial facilities | Warehouse Repurchase Facility | Financial Services      
Segment Reporting Information [Line Items]      
Collateralized interest in originated commercial loans financed 75.00%    
CMBS | Financial Services      
Segment Reporting Information [Line Items]      
Investments held-to-maturity $ 164,900,000   166,000,000.0
Impairment charges for CMBS securities $ 0 $ 0  
Minimum | CMBS | Financial Services      
Segment Reporting Information [Line Items]      
Discount rate as a percentage of face value for held-to-maturity securities 6.00%    
Coupon rate for held-to-maturity securities 2.00%    
Maximum | CMBS | Financial Services      
Segment Reporting Information [Line Items]      
Discount rate as a percentage of face value for held-to-maturity securities 84.00%    
Coupon rate for held-to-maturity securities 5.30%    
Secured Debt | Financing Agreement to Purchase Commercial Mortgage Backed Securities | Financial Services      
Segment Reporting Information [Line Items]      
Outstanding debt $ 153,900,000   $ 154,700,000
Interest rate 3.40%