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Summary of Significant Accounting Policies (Narrative) (Details)
 12 Months Ended
Nov. 30, 2021
USD ($)
vote
communities
$ / shares
shares
Nov. 30, 2020
USD ($)
communities
$ / shares
shares
Nov. 30, 2019
USD ($)
$ / shares
shares
Oct. 31, 2021
USD ($)
shares
Jan. 31, 2021
USD ($)
shares
Segment Reporting Information [Line Items]          
Advertising costs $ 74,200,000 $ 72,600,000 $ 84,300,000    
Cash held in escrow $ 940,400,000 $ 314,300,000      
Escrow deposit period 3 days 3 days      
Number of active communities | communities 1,259 1,173      
Held-to-maturity securities, term 3 years        
Deferred tax assets, valuation allowance $ 2,693,000 $ 4,411,000      
Self-insurance reserve $ 169,100,000 125,400,000      
Authorized amount under stock repurchase program       $ 1,000,000,000 $ 1,000,000,000
Originally authorized shares under the stock repurchase program (in shares) | shares       25,000,000 25,000,000
Stock repurchase program, value repurchased       $ 1,000,000,000  
Maximum dividend rate as a percentage of net income in the event of default 50.00%        
Compensation expense $ 29,400,000 27,300,000 $ 24,500,000    
Right-of-use assets 155,616,000        
Operating lease liability 163,513,000        
Operating Segments          
Segment Reporting Information [Line Items]          
Available-for-sale securities 41,654,000 53,497,000      
Held-to-maturity securities 157,808,000 164,230,000      
Investments in equity securities $ 1,006,599,000 $ 68,771,000      
Executive Chairman          
Segment Reporting Information [Line Items]          
Voting power 35.00%        
Preferred Stock          
Segment Reporting Information [Line Items]          
Preferred stock, shares authorized (in shares) | shares 500,000        
Preferred stock, par value (in usd per share) | $ / shares $ 10        
Participating Preferred Stock          
Segment Reporting Information [Line Items]          
Preferred stock, shares authorized (in shares) | shares 100,000,000        
Preferred stock, par value (in usd per share) | $ / shares $ 0.10        
Preferred stock, shares issued (in shares) | shares 0        
Class A Common Stock          
Segment Reporting Information [Line Items]          
Cash dividends (in USD per share) | $ / shares $ 1.00 $ 0.625 $ 0.16    
Votes per share | vote 1        
Class B Common Stock          
Segment Reporting Information [Line Items]          
Cash dividends (in USD per share) | $ / shares $ 1.00 $ 0.625 $ 0.16    
Votes per share | vote 10        
Financial Services          
Segment Reporting Information [Line Items]          
Held-to-maturity securities $ 157,800,000 $ 164,200,000      
Financial Services | Operating Segments          
Segment Reporting Information [Line Items]          
Available-for-sale securities 0 0      
Held-to-maturity securities 157,808,000 164,230,000      
Investments in equity securities 0      
Lennar Other          
Segment Reporting Information [Line Items]          
Available-for-sale securities 41,700,000 53,500,000      
Lennar Other | Operating Segments          
Segment Reporting Information [Line Items]          
Available-for-sale securities 41,654,000 53,497,000      
Held-to-maturity securities 0 0      
Investments in equity securities 1,006,599,000 68,771,000      
Homebuilding          
Segment Reporting Information [Line Items]          
Interest incurred 275,100,000 353,400,000 $ 422,700,000    
Interest capitalized 254,900,000 331,000,000 $ 405,100,000    
Homebuilding | Operating Segments          
Segment Reporting Information [Line Items]          
Available-for-sale securities 0 0      
Held-to-maturity securities 0 0      
Investments in equity securities $ 0      
Stock Option Awards          
Segment Reporting Information [Line Items]          
Expiration period 10 years        
Nonvested shares          
Segment Reporting Information [Line Items]          
Unrecognized compensation expense related to unvested share-based awards granted $ 118,500,000        
Weighted average remaining contractual life of unrecognized compensation expense related to unvested share-based awards 1 year 8 months 12 days        
Nonvested shares vested (in shares) | shares 1,829,016 1,400,000 1,400,000    
Discount rate | Minimum          
Segment Reporting Information [Line Items]          
Communities, unobservable inputs 0.10        
Discount rate | Maximum          
Segment Reporting Information [Line Items]          
Communities, unobservable inputs 0.20        
Operating properties          
Segment Reporting Information [Line Items]          
Estimated useful life 30 years        
Furniture, fixtures and equipment | Minimum          
Segment Reporting Information [Line Items]          
Estimated useful life 2 years        
Furniture, fixtures and equipment | Maximum          
Segment Reporting Information [Line Items]          
Estimated useful life 10 years        
Leasehold improvements          
Segment Reporting Information [Line Items]          
Estimated useful life 5 years