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Notes Payable - Narrative (Details) - USD ($) | Aug. 01, 2016 | Mar. 31, 2017 | Sep. 30, 2016
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Outstanding letters of credit |  | $ 78,700,000 |
Homebuilding [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Authorized repurchase of debt securities | $ 500,000,000 |  |
Debt repurchase program, remaining authorized repurchase amount |  | 500,000,000 |
Financial Services and Other [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing capacity on revolving credit facility |  | 600,000,000 |
Maximum borrowing capacity on revolving credit facility |  | 1,000,000,000 |
Mortgage loans held for sale pledged under repurchase agreement |  | 528,400,000 |
Mortgage loans, collateral value |  | 509,700,000 |
Advance pay downs on mortgage repurchase facility |  | 90,700,000 |
Mortgage repurchase obligation outstanding |  | $ 419,000,000 | $ 473,000,000
Interest rate on mortgage repurchase facility |  | 3.10% |
Unsecured Debt [Member] | Homebuilding [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt issuance costs |  | $ 11,300,000 | 13,300,000
Line of Credit [Member] | Homebuilding [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing capacity on revolving credit facility |  | 975,000,000 |
Maximum borrowing capacity on revolving credit facility |  | $ 1,250,000,000 |
Letters of credit, sublimit borrowing capacity, as a percentage |  | 50.00% |
Borrowings outstanding |  | $ 0 | $ 0
Outstanding letters of credit |  | 75,400,000 |
Weighted Average [Member] | Financial Services and Other [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing capacity on revolving credit facility |  | 725,000,000 |
Maximum [Member] | Financial Services and Other [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Borrowing capacity on revolving credit facility |  | $ 800,000,000 |

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- Definition Interest rate on the amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Amount to be repaid to the counterparty to the repurchase agreement when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under the repurchase agreement exceeds 10 percent of total assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(ii)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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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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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying amount, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of repurchase obligations, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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