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Operating and Reporting Segments (Narrative) (Details) - USD ($)
shares in Millions
3 Months Ended 9 Months Ended
Aug. 31, 2021
Aug. 31, 2020
Aug. 31, 2021
Aug. 31, 2020
Nov. 30, 2020
Segment Reporting Information [Line Items]          
Lennar's carrying value of investments $ 2,053,701,000   $ 2,053,701,000   $ 2,064,921,000
Doma Holdings, Inc          
Segment Reporting Information [Line Items]          
Unconsolidated entities ownership percentage 25.00%   25.00%    
Lennar's carrying value of investments $ 62,400,000   $ 62,400,000    
Financial Services          
Segment Reporting Information [Line Items]          
Lennar's carrying value of investments $ 0   $ 0   $ 0
Financial Services | Warehouse Repurchase Facility          
Segment Reporting Information [Line Items]          
Collateral percentage 80.00%   80.00%    
Lennar Other | Level 3 | Terminal Value Multiple          
Segment Reporting Information [Line Items]          
Discontinued operation, equity consideration, measurement input 3   3    
Lennar Other | Level 3 | Discount rate          
Segment Reporting Information [Line Items]          
Discontinued operation, equity consideration, measurement input 0.15   0.15    
Lennar Other | Sunnova Energy International Inc. | Disposal Group, Held-for-sale, Not Discontinued Operations          
Segment Reporting Information [Line Items]          
Gain on sale $ 1,531,000 $ 0 $ 153,006,000 $ 0  
Number of shares received upon closing (in shares) 3.1        
CMBS | Financial Services          
Segment Reporting Information [Line Items]          
Impairment charges for CMBS securities $ 0 $ 0 $ 0 $ 0