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Spin-Off and Other Significant Business Transactions - Additional Information (Details) |  |  |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 10, 2025 | Jun. 25, 2025 USD ($) Property | May 12, 2025 USD ($) | Feb. 10, 2025 USD ($) Property | Feb. 07, 2025 USD ($) Property $ / shares shares | Dec. 31, 2025 USD ($) Property $ / shares shares | Nov. 26, 2025 shares | Sep. 11, 2025 USD ($) | Aug. 07, 2025 USD ($)
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Number of homesites | Property |  |  |  |  |  | 933 |  |  |
Cash contribution |  |  |  |  |  | $ 415,152,000 |  |  |
Common stock par value per share | $ / shares |  |  |  |  |  | $ 0.01 |  |  |
Deferred tax liabilities |  |  |  |  |  | $ 77,333,000 |  |  |
Deferred tax asset |  |  |  |  |  | 109,282,000 |  |  |
Earnest Money Deposits |  |  |  |  |  | 4,000,000 |  |  |
Development guarantee holdbacks |  |  |  |  |  | 100,000,000 |  |  |
Land banking proceeds to acquire amount |  |  |  |  |  | $ 858,938,000 |  |  |
Rausch Land Assets |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Number of homesites | Property |  |  |  | 25,000 |  |  |  |  |
Deferred tax liabilities |  |  |  | $ 116,700,000 |  |  |  |  |
Earnest Money Deposits |  |  |  | 7,600,000 |  |  |  |  |
Cash payment received from acquisition |  |  |  | 858,900,000 |  |  |  |  |
Option deposits |  |  |  | 90,300,000 |  |  |  |  |
Development guarantee holdbacks |  |  |  | $ 100,000,000 |  |  |  |  |
Landsea Homes | Agreement with New Home Company |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Number of homesites | Property |  | 4,186 |  |  |  |  |  |  |
Land banking proceeds to acquire amount |  | $ 494,500,000 |  |  |  |  |  |  |
Acquisition in land assets |  | 522,800,000 |  |  |  |  |  |  |
Option contract to acquire business |  | $ 28,300,000 |  |  |  |  |  |  |
Landsea Homes | Maximum | Agreement with New Home Company |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Land banking proceeds to acquire amount |  |  | $ 700,000,000 |  |  |  |  |  |
Rausch Coleman Companies, LLC |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  | 100.00% |  |  |  |  |
Acquisition in land assets |  |  |  | $ 1,158,000,000 |  |  |  |  |
Rausch Coleman Companies, LLC | Rausch Land Assets |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Cash payment received from acquisition |  |  |  | $ 859,000,000 |  |  |  |  |
Class A Common Stock |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Common stock par value per share | $ / shares |  |  |  |  |  | $ 0.01 |  |  |
Class B Common Stock |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Common stock par value per share | $ / shares |  |  |  |  |  | $ 0.01 |  |  |
Lennar Class A Common Stock |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Percentage of common shares outstanding | 20.00% |  |  |  |  |  |  |  |
Shares owned | shares |  |  |  |  |  |  | 8,049,594 |  |
Millrose Class A Common Stock |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Shares owned | shares |  |  |  |  |  |  | 33,298,754 |  |
2030 Notes | Agreement with New Home Company |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  |  | $ 1,250,000,000
Principal amount stated percentage |  |  |  |  |  |  |  |  | 6.375%
2032 Notes | Agreement with New Home Company |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  |  |  |  |  | $ 750,000,000 |
Principal amount stated percentage |  |  |  |  |  |  |  | 6.25% |
Revolving Credit Facility |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Commitment amount |  |  |  |  | $ 1,335,000,000 | $ 1,335,000,000 |  |  |
Maturity date |  |  |  |  |  | Feb. 07, 2028 |  |  |
Lennar Corporation |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Percentage of ownership interest after disposal |  |  |  |  | 20.00% |  |  |  |
Spin-Off |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Stockholders equity for contributions |  |  |  |  | $ 5,200,000,000 |  |  |  |
Spin-Off | Lennar Corporation |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Percentage of ownership interest sold |  |  |  |  | 80.00% |  |  |  |
Land assets |  |  |  |  | $ 5,500,000,000 |  |  |  |
Number of homesites | Property |  |  |  |  | 87,000 |  |  |  |
Cash |  |  |  |  | $ 1,000,000,000 |  |  |  |
Cash deposits |  |  |  |  | 585,000,000 |  |  |  |
Cash contribution |  |  |  |  | 415,000,000 |  |  |  |
Common stock issued, Spin-Off |  |  |  |  | 1,300,000 |  |  |  |
Liabilities for seller notes |  |  |  |  | 19,000,000 |  |  |  |
Liabilities for prepaid due diligence costs |  |  |  |  | 77,900,000 |  |  |  |
Deferred tax asset |  |  |  |  | 59,800,000 |  |  |  |
Stockholders equity for contributions |  |  |  |  | 5,900,000,000 |  |  |  |
Spin-Off related costs |  |  |  |  | $ 77,900,000 |  |  |  |
Spin-Off | Lennar Corporation | Class A Common Stock |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Distribution of common stock | shares |  |  |  |  | 120,983,633 | 120,983,633 |  |  |
Common stock par value per share | $ / shares |  |  |  |  | $ 0.01 |  |  |  |
Common stock issued, Spin-Off |  |  |  |  | $ 300,000 |  |  |  |
Retained shares | shares |  |  |  |  | 33,200,053 | 33,200,053 |  |  |
Spin-Off | Lennar Corporation | Class B Common Stock |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Distribution of common stock | shares |  |  |  |  | 11,819,811 | 11,819,811 |  |  |
Common stock par value per share | $ / shares |  |  |  |  | $ 0.01 |  |  |  |
Spin-Off | Lennar Corporation | Revolving Credit Facility |  |  |  |  |  |  |  |  |
Business Combination [Line Items] |  |  |  |  |  |  |  |  |
Commitment amount |  |  |  |  | $ 1,335,000,000 |  |  |  |
Maturity date |  |  |  |  | Feb. 07, 2028 |  |  |  |

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