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Notes Payable - Additional Information and Homebuilding Textuals (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Aug. 01, 2017 | Jun. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016
Maturities of Long-term Debt [Abstract] |  |  |  |
Maturities of notes payable in fiscal 2018 |  |  | $ 829,600,000 |
Maturities of notes payable in fiscal 2019 |  |  | 500,800,000 |
Maturities of notes payable in fiscal 2020 |  |  | 500,700,000 |
Maturities of notes payable in fiscal 2021 |  |  | 0 |
Maturities of notes payable in fiscal 2022 |  |  | 350,000,000 |
Maturities of notes payable thereafter |  |  | 700,000,000 |
Letters of credit, amount outstanding |  |  | 96,800,000 |
Homebuilding [Member] |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |
Authorized repurchase of debt securities | $ 500,000,000 |  |  |
Debt repurchase program, remaining authorized repurchase amount |  |  | 500,000,000 |
Homebuilding [Member] | Unsecured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unamortized Debt Issuance Expense |  |  | 9,500,000 | $ 13,300,000
Homebuilding [Member] | Revolving credit facility, maturing 2018 [Member] |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |
Line of credit, current borrowing capacity |  | $ 975,000,000 | 1,275,000,000 |
Line of credit, maximum borrowing capacity |  |  | $ 1,900,000,000 |
Letter of Credit, Maximum Borrowing Capacity |  |  | 50.00% |
Proceeds from Lines of Credit |  |  | $ 835,000,000 |
Repayments of Lines of Credit |  |  | 835,000,000 |
Line of credit, amount outstanding |  |  | 0 | $ 0
Letters of credit, amount outstanding |  |  | $ 94,300,000 |
Senior Note Twenty Four [Member] | Homebuilding [Member] | Unsecured Debt [Member] |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |
Maturities of Senior Debt |  | $ 350,000,000 |  |
Senior notes, stated interest rate |  |  | 4.75% |
Senior Notes Subject to Repurchase Upon Change of Control and Ratings Downgrade [Member] | Homebuilding [Member] | Unsecured Debt [Member] |  |  |  |
Maturities of Long-term Debt [Abstract] |  |  |  |
Debt Instrument, Redemption Price, Percentage |  |  | 101.00% |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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