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Notes Payable (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Sep. 30, 2017
--- | --- | ---
Unsecured: |  |
Notes payable | $ 3,258.1 | $ 2,871.6
Homebuilding [Member] |  |
Unsecured: |  |
Notes payable | 2,749.6 | 2,451.6
Revolving credit facility, maturing 2022 | 300.0 | 0.0
Forestar Group [Member] |  |
Unsecured: |  |
Notes payable | 121.0 |
Financial Services [Member] |  |
Unsecured: |  |
Notes payable | 387.5 | 420.0
Forestar Group [Member] |  |
Unsecured: |  |
Notes payable | $ 108.4 |
3.625% senior notes due 2018 [Member] | Homebuilding [Member] |  |
Unsecured: |  |
Stated interest rate | 3.625% |
Notes payable | $ 0.0 | 399.7
3.75% senior notes due 2019 [Member] | Homebuilding [Member] |  |
Unsecured: |  |
Stated interest rate | 3.75% |
Notes payable | $ 499.0 | 498.8
4.0% senior notes due 2020 [Member] | Homebuilding [Member] |  |
Unsecured: |  |
Stated interest rate | 4.00% |
Notes payable | $ 498.1 | 497.9
2.55% senior notes due 2020 [Member] | Homebuilding [Member] |  |
Unsecured: |  |
Stated interest rate | 2.55% |
Notes payable | $ 397.4 | 0.0
4.375% senior notes due 2022 [Member] | Homebuilding [Member] |  |
Unsecured: |  |
Stated interest rate | 4.375% |
Notes payable | $ 348.1 | 348.1
4.75% senior notes due 2023 [Member] | Homebuilding [Member] |  |
Unsecured: |  |
Stated interest rate | 4.75% |
Notes payable | $ 298.5 | 298.4
5.75% senior notes due 2023 [Member] | Homebuilding [Member] |  |
Unsecured: |  |
Stated interest rate | 5.75% |
Notes payable | $ 397.7 | 397.6
3.75% convertible senior notes due 2020 [Member] | Forestar Group [Member] |  |
Unsecured: |  |
Notes payable | $ 120.7 |
3.75% convertible senior notes due 2020 [Member] | Forestar Group [Member] |  |
Unsecured: |  |
Stated interest rate | 3.75% |
Secured Debt [Member] | Homebuilding [Member] |  |
Unsecured: |  |
Notes payable | $ 10.8 | $ 11.1
Secured Debt [Member] | Forestar Group [Member] |  |
Unsecured: |  |
Notes payable | $ 0.3 |

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- Definition Contractual interest rate for funds borrowed, under the debt 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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 Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer. + 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(a)(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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