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Notes Payable Notes Payable - Forestar Textuals (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019
Debt Instrument [Line Items] |  |
Letters of credit, amount outstanding | $ 178.9 |
Forestar Consolidated [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit, current borrowing capacity | 380.0 |
Line of credit, maximum borrowing capacity | 570.0 |
Letter of Credit, Maximum Borrowing Capacity (in dollars) | $ 100.0 |
Letter of Credit, Maximum Borrowing Capacity | 50.00% |
Line of credit, amount outstanding | $ 0.0 | $ 0.0
Letters of credit, amount outstanding | 36.0 |
Line of Credit Facility, Remaining Borrowing Capacity | 344.0 |
Authorized Repurchase Of Debt Securities | 30.0 |
Debt Repurchase Authorization Remaining | $ 30.0 |
Forestar Consolidated [Member] | Senior Note Member Forty [Member] |  |
Debt Instrument [Line Items] |  |
Senior notes, stated interest rate | 3.75% |
Maturities of Senior Debt | $ 118.9 |
Forestar Consolidated [Member] | Senior Note Member Forty One [Member] |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 350.0 |
Senior notes, stated interest rate | 8.00% |
Debt Instrument, Maturity Date | Apr. 15, 2024 |
Forestar Consolidated [Member] | Senior Note Member Forty Three |  |
Debt Instrument [Line Items] |  |
Debt Instrument, Face Amount | $ 300.0 |
Senior notes, stated interest rate | 5.00% |
Debt Instrument, Maturity Date | Mar. 01, 2028 |
Debt Instrument, Interest Rate, Effective Percentage | 5.20% |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&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://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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=120400017&loc=d3e572229-122910 + Details
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