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Notes Payable - Homebuilding Textuals (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2020 | May 01, 2020 | Oct. 01, 2019 | Sep. 30, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  |  |  | $ 4,283.3 |  |  | $ 3,399.4
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Maturities of notes payable in fiscal 2019 |  |  |  | 1,600.0 |  |  |
Maturities of notes payable in fiscal 2020 |  |  |  | 350.3 |  |  |
Maturities of notes payable in fiscal 2021 |  |  |  | 700.4 |  |  |
Maturities of notes payable in fiscal 2022 |  |  |  | 352.7 |  |  |
Maturities of notes payable in fiscal 2023 |  |  |  | 500.4 |  |  |
Long-Term Debt, Maturity, after Year Five |  |  |  | 800.8 |  |  |
Letters of credit, amount outstanding |  |  |  | $ 178.9 |  |  |
Percentage of Company Assets Owned by Entities that Guarantee Homebuilding Senior Notes and Revolving Credit Facility |  |  |  | 79.00% |  |  |
Home Building [Member] |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  |  |  | $ 2,514.4 |  |  | 2,047.6
Home Building Consolidated |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notes payable |  |  |  | 2,509.6 |  |  | 2,047.6
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Line of credit, current borrowing capacity |  |  |  | 1,590.0 |  |  |
Line of credit, maximum borrowing capacity |  |  |  | $ 2,500.0 |  |  |
Letter of Credit, Maximum Borrowing Capacity |  |  |  | 100.00% |  |  |
Proceeds from Lines of Credit |  |  |  | $ 1,060.0 |  |  |
Repayments of Long-term Lines of Credit |  |  |  | 1,060.0 |  |  |
Line of credit, amount outstanding |  |  |  | 0.0 |  |  | 0.0
Letters of credit, amount outstanding |  |  |  | 142.9 |  |  |
Line of Credit Facility, Remaining Borrowing Capacity |  |  |  | 1,450.0 |  |  |
Authorized repurchase of debt securities |  |  |  | 500.0 |  |  |
Debt repurchase program, remaining authorized repurchase amount |  |  |  | 500.0 |  |  |
Home Building Consolidated | Short-term Debt [Member] |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Line of credit, current borrowing capacity |  |  |  | 375.0 |  |  |
Line of credit, maximum borrowing capacity |  |  |  | $ 550.0 |  |  |
SeniorNoteFortyTwo [Member] | Home Building Consolidated |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes, stated interest rate |  |  |  | 2.50% |  | 2.50% |
Notes payable |  |  |  | $ 496.5 |  |  | 0.0
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 500.0 |  | $ 500.0 |
Debt Instrument, Maturity Date |  |  | Oct. 15, 2024 | Oct. 15, 2024 |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 2.70% |  | 2.70% |
Debt Instrument, Call Feature |  |  |  | Yes |  |  |
Senior Notes Subject to Repurchase Upon Change of Control and Ratings Downgrade [Member] | Home Building Consolidated |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 101.00% |  |  |
Senior Note Thirty [Member] | Home Building Consolidated |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes, stated interest rate |  |  |  | 4.00% |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Maturities of Senior Debt |  | $ 500.0 |  |  |  |  |
SeniorNoteFortyFour | Home Building Consolidated |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes, stated interest rate |  |  |  | 2.60% | 2.60% |  |
Notes payable |  |  |  | $ 495.1 |  |  | 0.0
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 500.0 | $ 500.0 |  |
Debt Instrument, Maturity Date |  |  |  | Oct. 15, 2025 |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 2.80% | 2.80% |  |
Debt Instrument, Call Feature |  |  |  | Yes |  |  |
SeniorNoteTwentyEight [Member] | Home Building Consolidated |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes, stated interest rate |  |  |  | 5.75% |  |  |
Notes payable |  |  |  | $ 398.7 |  |  | $ 398.4
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  | $ 400.0 |  |  |
Debt Instrument, Maturity Date |  |  |  | Aug. 15, 2023 |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  | 5.90% |  |  |
Debt Instrument, Call Feature |  |  |  | Yes |  |  |
Senior Notes [Member] | Home Building Consolidated |  |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  |  | 100.00% |  |  |
Subsequent Event [Member] | Senior Note Forty Five [Member] | Home Building Consolidated |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Senior notes, stated interest rate | 1.40% |  |  |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |  |  |  |
Debt Instrument, Face Amount | $ 500.0 |  |  |  |  |  |
Debt Instrument, Maturity Date | Oct. 15, 2027 |  |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage | 1.60% |  |  |  |  |  |

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