Real Estate - Text (Detail) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |||
---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Sep. 30, 2024 |
|
Real Estate Properties [Line Items] | |||||
Real estate | $ 2,823.5 | $ 2,823.5 | $ 2,266.2 | ||
Payments to Acquire Residential Real Estate | 532.6 | ||||
Payments to Develop Real Estate Assets | 864.3 | ||||
Asset Impairment Charges | 0.0 | $ 0.0 | |||
Loss on Contract Termination | 1.9 | $ 0.7 | 3.9 | $ 1.0 | |
Developed and under development projects | |||||
Real Estate Properties [Line Items] | |||||
Real estate | 2,574.6 | 2,574.6 | 2,126.1 | ||
Land held for future development | |||||
Real Estate Properties [Line Items] | |||||
Real estate | $ 248.9 | $ 248.9 | $ 140.1 | ||
D.R. Horton, Inc. [Member] | Minimum | |||||
Real Estate Properties [Line Items] | |||||
Related Party Transaction, Rate | 12.00% | ||||
D.R. Horton, Inc. [Member] | Maximum | |||||
Real Estate Properties [Line Items] | |||||
Related Party Transaction, Rate | 16.00% |