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Fair Value Measurements (Tables) | 9 Months Ended
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Jun. 30, 2018
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 June 30, 2018 and September 30, 2017, and the changes in the fair value of the Level 3 assets during the nine months ended June 30, 2018 and 2017.
|  |  | Fair Value at June 30, 2018
| Balance Sheet Location |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  |  | (In millions)
Debt securities collateralized by residential real estate | Other assets |  | $ | — |  |  | $ | — |  |  | $ | 8.8 |  |  | $ | 8.8 |
Mortgage loans held for sale (a) | Mortgage loans held for sale |  | — |  |  | 670.3 |  |  | 6.6 |  |  | 676.9 |
Derivatives not designated as hedging instruments (b): |  |  |  |  |  |  |  |  |
Interest rate lock commitments | Other assets |  | — |  |  | 17.1 |  |  | — |  |  | 17.1 |
Forward sales of MBS | Other liabilities |  | — |  |  | (3.2 | ) |  | — |  |  | (3.2 | )
Best-efforts and mandatory commitments | Other liabilities |  | — |  |  | (0.3 | ) |  | — |  |  | (0.3 | )
|  |  | Fair Value at September 30, 2017
| Balance Sheet Location |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
|  |  | (In millions)
Debt securities collateralized by residential real estate | Other assets |  | $ | — |  |  | $ | — |  |  | $ | 8.8 |  |  | $ | 8.8 |
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 |
| Level 3 Assets at Fair Value for the Nine Months Ended June 30, 2018
| Balance at September 30, 2017 |  | Net realized and unrealized gains (losses) |  | Purchases |  | Sales and Settlements |  | Principal Reductions |  | Net transfers to (out of) Level 3 |  | Balance at June 30, 2018
| (In millions)
Debt securities collateralized by residential real estate | $ | 8.8 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 8.8 |
Mortgage loans held for sale (a) | 5.6 |  |  | 0.7 |  |  | — |  |  | (6.8 | ) |  | — |  |  | 7.1 |  |  | 6.6 |
| Level 3 Assets at Fair Value for the Nine Months Ended June 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 June 30, 2017
| (In millions)
Debt securities collateralized by residential real estate | $ | — |  |  | $ | — |  |  | $ | 8.8 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 8.8 |
Mortgage loans held for sale (a) | 6.8 |  |  | 0.8 |  |  | — |  |  | (8.9 | ) |  | — |  |  | 6.6 |  |  | 5.3 |
___________________
(a) | The Company typically elects the fair value option upon origination for mortgage loans held for sale. Interest income earned on mortgage loans held for sale is based on contractual interest rates and included in other income. Mortgage loans held for sale valued using Level 3 inputs at June 30, 2018 and September 30, 2017 include $6.6 million and $5.6 million, respectively, of loans for which the Company elected the fair value option upon origination and did not sell into the secondary market. Mortgage loans held for sale totaling $7.1 million and $6.6 million were transferred to Level 3 during the nine months ended June 30, 2018 and 2017, 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 accrued expenses and other liabilities. Changes in the fair value of these derivatives are included in 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 June 30, 2018 and September 30, 2017:
|  |  | Fair Value at June 30, 2018 |  | Fair Value at September 30, 2017
| Balance Sheet Location |  | Level 2 |  | Level 3 |  | Level 2 |  | Level 3
|  |  | (In millions)
Inventory held and used (a) (b) | Inventories |  | $ | — |  |  | $ | 10.1 |  |  | $ | — |  |  | $ | 33.4 |
Inventory available for sale (a) (c) | Inventories |  | — |  |  | — |  |  | — |  |  | 1.2 |
Mortgage loans held for sale (a) (d) | Mortgage loans held for sale |  | — |  |  | 2.6 |  |  | — |  |  | 0.6 |
Other mortgage loans (a) (e) | Other assets |  | — |  |  | 0.8 |  |  | — |  |  | 1.4 |
___________________
(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 12% 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 and are valued at the lower of carrying value or fair value. 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 value of other mortgage loans was determined based on the value of the underlying collateral.
Carrying values and fair values of financial assets and liabilities not reflected at fair value | 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 June 30, 2018 and September 30, 2017:
| Carrying Value |  | Fair Value at June 30, 2018
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In millions)
Cash and cash equivalents (a) | $ | 1,178.2 |  |  | $ | 1,178.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,178.2 |
Restricted cash (a) | 58.7 |  |  | 58.7 |  |  | — |  |  | — |  |  | 58.7 |
Notes payable (b) (c) | 3,093.6 |  |  | — |  |  | 2,616.3 |  |  | 532.8 |  |  | 3,149.1 |
| Carrying Value |  | Fair Value at September 30, 2017
|  | Level 1 |  | Level 2 |  | Level 3 |  | Total
| (In millions)
Cash and cash equivalents (a) | $ | 1,007.8 |  |  | $ | 1,007.8 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,007.8 |
Restricted cash (a) | 16.5 |  |  | 16.5 |  |  | — |  |  | — |  |  | 16.5 |
Notes payable (b) (c) | 2,871.6 |  |  | — |  |  | 2,584.1 |  |  | 431.1 |  |  | 3,015.2 |
___________________
(a) | The fair values of cash, cash equivalents and restricted cash approximate their carrying values due to their short-term nature and are classified as Level 1 within the fair value hierarchy.
(b) | The fair value of the senior notes is determined based on quoted prices, which is classified as Level 2 within the fair value hierarchy.
(c) | The fair values of other secured notes and borrowings on the revolving credit facility and the mortgage repurchase facility approximate carrying value due to their short-term nature or floating interest rate terms, as applicable, and are classified as Level 3 within the fair value hierarchy.

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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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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13476-108611 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13467-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=75026489&loc=d3e13220-108610 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 + Details
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