Capitalized Interest (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||||||
|---|---|---|---|---|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2026 |
Mar. 31, 2025 |
Dec. 31, 2025 |
Sep. 30, 2025 |
Dec. 31, 2024 |
Sep. 30, 2024 |
|
| Statement [Line Items] | ||||||||
| Real Estate Inventory, Capitalized Interest Costs | $ 91.5 | $ 71.9 | $ 91.5 | $ 71.9 | $ 86.0 | $ 77.8 | $ 67.7 | $ 63.0 |
| Interest incurred | 12.5 | 10.6 | 25.0 | 18.8 | ||||
| Interest charged to cost of sales | $ (7.0) | $ (6.4) | $ (11.3) | $ (9.9) | ||||