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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 |  |  |  |

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