| Cover page Cover Page | Jan. 08, 2020 |
| Entity Information [Line Items] | |
| Entity Incorporation, State or Country Code | DE |
| Document Type | 8-K |
| Document Period End Date | Jan. 8, 2020 |
| Entity Registrant Name | LENNAR CORP /NEW/ |
| Entity Address, Address Line One | 700 Northwest 107th Avenue |
| Entity Address, City or Town | Miami |
| Entity Address, State or Province | FL |
| Entity Address, Postal Zip Code | 33172 |
| City Area Code | (305) |
| Local Phone Number | 559-4000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000920760 |
| Amendment Flag | false |
| Entity File Number | 1-11749 |
| Entity Tax Identification Number | 95-4337490 |
| Class A Common Stock, par value $.10 | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Class A Common Stock, par value $.10 |
| Trading Symbol | LEN |
| Security Exchange Name | NYSE |
| Class B Common Stock, par value $.10 | |
| Entity Information [Line Items] | |
| Title of 12(b) Security | Class B Common Stock, par value $.10 |
| Trading Symbol | LEN.B |
| Security Exchange Name | NYSE |
