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BALANCE SHEETS - USD ($)
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Inventories      
Cash $ 100 $ 100  
Total assets 100 100  
Stockholders' equity      
Common Stock, $0.01 par value, 100 shares authorized; 100 shares issued and outstanding 1 1  
Additional paid-in capital 99 99  
Total liabilities and stockholders' equity 100 $ 100  
PREDECESSOR MILLROSE BUSINESS [Member]      
Inventories      
Land and land under development 2,978,807,000   $ 2,914,993,000
Finished homesites 2,486,483,000   1,829,129,000
Total inventories 5,465,290,000   4,744,122,000
Total assets 5,465,290,000   4,744,122,000
Liabilities and stockholders' equity      
Accounts payable and accrued expenses 282,730,000   252,554,000
Debt 24,188,000   32,607,000
Total liabilities 306,918,000   285,161,000
Commitments and contingencies (See Note 3)  
Stockholders' equity      
Net parent investment 5,158,372,000   4,458,961,000
Total equity 5,158,372,000   4,458,961,000
Total liabilities and stockholders' equity $ 5,465,290,000   $ 4,744,122,000