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Fair Value Measurements (Tables) | 12 Months Ended
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Sep. 30, 2017
Fair Value Disclosures [Abstract] |
Fair value measurements of assets and liabilities on a recurring basis | The following tables summarize the Company’s assets and liabilities measured at fair value on a recurring basis at September 30, 2017 and 2016, and the changes in the fair value of the Level 3 assets during fiscal 2017 and 2016.
|  |  | Fair Value at September 30, 2017
| Balance Sheet Location |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  |  | (In millions)
Homebuilding: |  |  |  |  |  |  |  |  |
Debt securities collateralized by residential real estate | Other assets |  | $ | — |  |  | $ | — |  |  | $ | 8.8 |  |  | $ | 8.8 |
Financial Services and Other: |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans held for sale (a) | Mortgage loans held for sale |  | — |  |  | 580.2 |  |  | 5.6 |  |  | 585.8 |
Derivatives not designated as hedging instruments (b): |  |  |  |  |  |  |  |  |  |  |  |
Interest rate lock commitments | Other assets |  | — |  |  | 9.4 |  |  | — |  |  | 9.4 |
Forward sales of MBS | Other assets |  | — |  |  | 1.1 |  |  | — |  |  | 1.1 |
Best-efforts and mandatory commitments | Other assets |  | — |  |  | 0.6 |  |  | — |  |  | 0.6 |
|  |  | Fair Value at September 30, 2016
| Balance Sheet Location |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  |  | (In millions)
Financial Services and Other: |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans held for sale (a) | Mortgage loans held for sale |  | $ | — |  |  | $ | 640.9 |  |  | $ | 6.8 |  |  | $ | 647.7 |
Derivatives not designated as hedging instruments (b): |  |  |  |  |  |  |  |  |  |  |  |
Interest rate lock commitments | Other assets |  | — |  |  | 9.3 |  |  | — |  |  | 9.3 |
Forward sales of MBS | Other liabilities |  | — |  |  | (2.6 | ) |  | — |  |  | (2.6 | )
Best-efforts and mandatory commitments | Other liabilities |  | — |  |  | (0.2 | ) |  | — |  |  | (0.2 | )
| Level 3 Assets at Fair Value for the Year Ended September 30, 2017
| Balance at September 30, 2016 |  | Net realized and unrealized gains (losses) |  | Purchases |  | Sales and Settlements |  | Principal Reductions |  | Net transfers to (out of) Level 3 |  | Balance at September 30, 2017
| (In millions)
Debt securities collateralized by residential real estate | $ | — |  |  | $ | — |  |  | $ | 8.8 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 8.8 |
Mortgage loans held for sale (a) | 6.8 |  |  | 1.3 |  |  | — |  |  | (13.4 | ) |  | — |  |  | 10.9 |  |  | 5.6 |
| Level 3 Assets at Fair Value for the Year Ended September 30, 2016
| Balance at September 30, 2015 |  | Net realized and unrealized gains (losses) |  | Purchases |  | Sales and Settlements |  | Principal Reductions |  | Net transfers to (out of) Level 3 |  | Balance at September 30, 2016
| (In millions)
Debt securities collateralized by residential real estate | $ | 33.9 |  |  | $ | 2.2 |  |  | $ | — |  |  | $ | (35.8 | ) |  | $ | (0.3 | ) |  | $ | — |  |  | $ | — |
Mortgage loans held for sale (a) | 13.9 |  |  | 2.4 |  |  | — |  |  | (27.1 | ) |  | — |  |  | 17.6 |  |  | 6.8 |
_____________
(a) | Mortgage loans held for sale are reflected at fair value. Interest income earned on mortgage loans held for sale is based on contractual interest rates and included in financial services interest and other income. Mortgage loans held for sale at September 30, 2017 and 2016 include $5.6 million and $6.8 million, respectively, of loans for which the Company elected the fair value option upon origination and which the Company did not sell into the secondary market. Mortgage loans held for sale totaling $10.9 million and $17.6 million were transferred to Level 3 during fiscal 2017 and 2016, respectively, due to significant unobservable inputs used in determining the fair value of these loans. The fair value of these mortgage loans held for sale is generally calculated considering pricing in the secondary market and adjusted for the value of the underlying collateral, including interest rate risk, liquidity risk and prepayment risk. The Company plans to sell these loans as market conditions permit.
(b) | Fair value measurements of these derivatives represent changes in fair value, as calculated by reference to quoted prices for similar assets, and are reflected in the balance sheet as other assets or other liabilities. Changes in the fair value of these derivatives are included in financial services revenues in the consolidated statements of operations
Fair value measurements of assets on a non-recurring basis | The following table summarizes the Company’s assets measured at fair value on a nonrecurring basis at September 30, 2017 and 2016:
|  |  | Fair Value at September 30, 2017 |  | Fair Value at September 30, 2016
| Balance Sheet Location |  | Level 2 |  | Level 3 |  | Level 2 |  | Level 3
|  |  | (In millions)
Homebuilding: |  |  |  |  |  |  |  |  |
Inventory held and used (a) (b) | Inventories |  | $ | — |  |  | $ | 33.4 |  |  | $ | — |  |  | $ | 5.2 |
Inventory available for sale (a) (c) | Inventories |  | — |  |  | 1.2 |  |  | — |  |  | 0.8 |
Financial Services and Other: |  |  |  |  |  |  |  |  |  |  |
Mortgage loans held for sale (a) (d) | Mortgage loans held for sale |  | — |  |  | 0.6 |  |  | 1.6 |  |  | 2.4 |
Other mortgage loans (a) (e) | Other assets |  | — |  |  | 1.4 |  |  | — |  |  | 3.8 |
Real estate owned (a) (e) | Other assets |  | — |  |  | — |  |  | — |  |  | 0.1 |
____________________
(a) | The fair values included in the table above represent only those assets whose carrying values were adjusted to fair value as a result of impairment in the respective period and were held at the end of the period.
(b) | In performing its impairment analysis of communities, discount rates ranging from 10% to 18% were used in the periods presented.
(c) | The fair value of inventory available for sale was determined based on recent offers received from outside third parties, comparable sales or actual contracts.
(d) | These mortgage loans have some degree of impairment affecting their marketability. When available, quoted prices in the secondary market are used to determine fair value (Level 2); otherwise, a cash flow valuation model is used to determine fair value (Level 3).
(e) | The fair values of other mortgage loans and real estate owned are determined based on the value of the underlying collateral
Fair value of financial assets and liabilities | For the financial assets and liabilities that the Company does not reflect at fair value, the following tables present both their respective carrying value and fair value at September 30, 2017 and 2016:
| Carrying Value |  | Fair Value at September 30, 2017
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In millions)
Homebuilding: |  |  |  |  |  |  |  |  |
Cash and cash equivalents (a) | $ | 973.0 |  |  | $ | 973.0 |  |  | $ | — |  |  | $ | — |  |  | $ | 973.0 |
Restricted cash (a) | 9.3 |  |  | 9.3 |  |  | — |  |  | — |  |  | 9.3 |
Senior notes (b) | 2,440.5 |  |  | — |  |  | 2,584.1 |  |  | — |  |  | 2,584.1 |
Other secured notes (a) | 11.1 |  |  | — |  |  | — |  |  | 11.1 |  |  | 11.1 |
Financial Services and Other: |  |  |  |  |  |  |  |  |
Cash and cash equivalents (a) | 34.8 |  |  | 34.8 |  |  | — |  |  | — |  |  | 34.8 |
Restricted cash (a) (c) | 7.2 |  |  | 7.2 |  |  | — |  |  | — |  |  | 7.2 |
Mortgage repurchase facility (a) | 420.0 |  |  | — |  |  | — |  |  | 420.0 |  |  | 420.0 |
| Carrying Value |  | Fair Value at September 30, 2016
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In millions)
Homebuilding: |  |  |  |  |  |  |  |  |
Cash and cash equivalents (a) | $ | 1,271.8 |  |  | $ | 1,271.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,271.8 |
Restricted cash (a) | 9.5 |  |  | 9.5 |  |  | — |  |  | — |  |  | 9.5 |
Senior notes (b) | 2,786.7 |  |  | — |  |  | 2,947.4 |  |  | — |  |  | 2,947.4 |
Other secured notes (a) | 11.6 |  |  | — |  |  | — |  |  | 11.6 |  |  | 11.6 |
Financial Services and Other: |  |  |  |  |  |  |  |  |
Cash and cash equivalents (a) | 31.4 |  |  | 31.4 |  |  | — |  |  | — |  |  | 31.4 |
Mortgage repurchase facility (a) | 473.0 |  |  | — |  |  | — |  |  | 473.0 |  |  | 473.0 |
____________________
(a) | The fair value approximates carrying value due to its short-term nature, short maturity or floating interest rate terms, as applicable.
(b) | The fair value is determined based on quoted prices, which is classified as Level 2 within the fair value hierarchy.
(c) | Restricted cash of the financial services segment represents escrow funds for taxes and insurance and is included in other assets in the Financial Services and Other section of the consolidated balance sheet.

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=66048111&loc=SL7498348-110258 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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