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Summary of Significant Accounting Policies (Narrative) (Details)
 1 Months Ended 12 Months Ended
Jan. 31, 2024
USD ($)
Nov. 30, 2024
USD ($)
vote
communities
$ / shares
shares
Nov. 30, 2023
USD ($)
communities
$ / shares
shares
Nov. 30, 2022
USD ($)
$ / shares
shares
Segment Reporting Information [Line Items]        
Advertising costs   $ 190,900,000 $ 146,000,000.0 $ 102,100,000
Cash held in escrow   $ 265,600,000 $ 594,800,000  
Escrow deposit period   2 days 2 days  
Number of active communities | communities   1,436 1,255  
Land under Purchase Options, Deposit   $ 3,500,000,000    
Held-to-maturity securities, term   3 years    
Deferred tax assets after valuation allowance   $ 658,292,000 $ 702,440,000  
Deferred tax assets, valuation allowance   2,593,000 2,333,000  
Self-insurance reserve   277,400,000 245,800,000  
Compensation expense   69,700,000 53,400,000 $ 37,500,000
Right-of-use assets   275,248,000    
Operating lease liability   262,119,000    
Net deferred tax assets   272,377,000 326,478,000  
Impairment of long lived assets     $ 36,800,000  
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]     Nonoperating Income (Expense)  
Stock Repurchase Program, Additional Shares Authorized For RepurchaseAmount $ 5,000,000,000      
Variable Interest Entity, Not Primary Beneficiary Including Third Parties        
Segment Reporting Information [Line Items]        
Increase in consolidated inventory not owned   1,100,000,000    
Operating Segments        
Segment Reporting Information [Line Items]        
Available-for-sale securities   40,578,000 $ 37,953,000  
Held-to-maturity securities   135,646,000 140,676,000  
Investments in equity securities   $ 347,810,000 $ 297,243,000  
Executive Chairman        
Segment Reporting Information [Line Items]        
Voting power   40.00%    
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 0  
Class A Common Stock        
Segment Reporting Information [Line Items]        
Cash dividends (in USD per share) | $ / shares   $ 2.00 $ 1.50 $ 1.50
Votes per share | vote   1    
Class B Common Stock        
Segment Reporting Information [Line Items]        
Cash dividends (in USD per share) | $ / shares   $ 2.00 $ 1.50 $ 1.50
Votes per share | vote   10    
Share Repurchase Program, Remaining Authorized, Amount   $ 3,400,000,000    
Financial Services        
Segment Reporting Information [Line Items]        
Net deferred tax assets   40,738,000 $ 36,821,000  
Financial Services | Operating Segments        
Segment Reporting Information [Line Items]        
Available-for-sale securities   0 0  
Held-to-maturity securities   135,646,000 140,676,000  
Investments in equity securities   0 0  
Lennar Other        
Segment Reporting Information [Line Items]        
Available-for-sale securities   40,600,000 38,000,000.0  
Net deferred tax assets   13,291,000 70,954,000  
Lennar Other | Operating Segments        
Segment Reporting Information [Line Items]        
Available-for-sale securities   40,578,000 37,953,000  
Held-to-maturity securities   0 0  
Investments in equity securities   347,810,000 297,243,000  
Homebuilding        
Segment Reporting Information [Line Items]        
Sales incentive, amount per home   $ 48,800 $ 42,900 $ 17,300
Sales incentive, amount per home, percentage   10.30% 8.80% 3.50%
Inventory write-down   $ 5,100,000 $ 19,900,000  
Interest incurred   129,300,000 187,600,000 $ 230,800,000
Interest capitalized   110,500,000 172,000,000.0 $ 211,700,000
Net deferred tax assets   146,299,000 163,917,000  
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 $ 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   $ 134,200,000    
Weighted average remaining contractual life of unrecognized compensation expense related to unvested share-based awards   1 year 9 months 18 days    
Nonvested shares vested (in shares) | shares   1,665,703 2,000,000.0 1,600,000
Discount rate | Valuation Technique, Discounted Cash Flow        
Segment Reporting Information [Line Items]        
Communities, unobservable inputs     0.15  
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