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Operating and Reporting Segments (Narrative) (Details)
3 Months Ended
Feb. 29, 2020
USD ($)
transaction
Feb. 28, 2019
USD ($)
transaction
Nov. 30, 2019
USD ($)
Segment Reporting Information [Line Items]      
Investments held-to-maturity $ 183,945,000   $ 244,406,000
Financial Services      
Segment Reporting Information [Line Items]      
Outstanding principal balance 698,369,000   1,423,650,000
Origination of loans receivable 412,300,000 $ 270,100,000  
Sale of loans held-for-sale $ 314,400,000 $ 200,500,000  
Number of securitization transactions | transaction 2 2  
Unsettled transactions $ 0    
Warehouse Repurchase Facility | Financial Services      
Segment Reporting Information [Line Items]      
Borrowings under facility 674,848,000   1,374,063,000
CMBS | Financial Services      
Segment Reporting Information [Line Items]      
Investments held-to-maturity 165,300,000   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 [Member] | Financial Services      
Segment Reporting Information [Line Items]      
Senior notes and other debts payable, net $ 153,800,000   $ 154,700,000