Real Estate - Text (Detail) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | |||
---|---|---|---|---|---|
Mar. 31, 2024 |
Mar. 31, 2023 |
Mar. 31, 2024 |
Mar. 31, 2023 |
Sep. 30, 2023 |
|
Real Estate Properties [Line Items] | |||||
Real estate | $ 2,115.9 | $ 2,115.9 | $ 1,790.3 | ||
Payments to Acquire Residential Real Estate | 350.0 | ||||
Payments to Develop Real Estate Assets | 450.3 | ||||
Asset Impairment Charges | 0.0 | $ 19.4 | 0.0 | $ 19.4 | |
Loss on Contract Termination | 0.2 | $ 0.9 | 0.4 | $ 3.3 | |
Developed and under development projects | |||||
Real Estate Properties [Line Items] | |||||
Real estate | 1,981.1 | 1,981.1 | 1,760.8 | ||
Land held for future development | |||||
Real Estate Properties [Line Items] | |||||
Real estate | $ 134.8 | $ 134.8 | $ 29.5 | ||
D.R. Horton, Inc. [Member] | Maximum | |||||
Real Estate Properties [Line Items] | |||||
Related Party Transaction, Rate | 16.00% | ||||
D.R. Horton, Inc. [Member] | Minimum | |||||
Real Estate Properties [Line Items] | |||||
Related Party Transaction, Rate | 12.00% |