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Fair Value Measurements - Assets and Liabilities Measured on Recurring Basis (Details) - USD ($) | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | --- | ---
Estimate fair value [Member] | Recurring [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities collateralized by residential real estate | $ 3,900,000 | $ 3,900,000 |
Mortgage loans held for sale | 1,518,300,000 | 1,065,100,000 |
Mortgage servicing rights | 17,100,000 |  |
Estimate fair value [Member] | Recurring [Member] | Interest rate lock commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | 31,300,000 | 19,200,000 |
Estimate fair value [Member] | Recurring [Member] | Forward Sales Of MBS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | (16,200,000) | (4,100,000) |
Estimate fair value [Member] | Recurring [Member] | Best-efforts and mandatory commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments |  | (1,000,000.0) |
Mortgage loans held for sale | 1,529,000,000.0 | 1,072,000,000.0 |
Mortgage servicing rights | 17,100,000 | 0 |
Recurring [Member] | Level 1 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities collateralized by residential real estate | 0 | 0 |
Mortgage loans held for sale | 0 | 0 |
Mortgage servicing rights | 0 |  |
Recurring [Member] | Level 1 [Member] | Interest rate lock commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | 0 | 0 |
Recurring [Member] | Level 1 [Member] | Forward Sales Of MBS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | 0 | 0 |
Recurring [Member] | Level 1 [Member] | Best-efforts and mandatory commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments |  | 0 |
Recurring [Member] | Level 2 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities collateralized by residential real estate | 0 | 0 |
Mortgage loans held for sale | 1,503,200,000 | 1,055,300,000 |
Mortgage servicing rights | 0 |  |
Recurring [Member] | Level 2 [Member] | Interest rate lock commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | 31,300,000 | 19,200,000 |
Recurring [Member] | Level 2 [Member] | Forward Sales Of MBS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | (16,200,000) | (4,100,000) |
Recurring [Member] | Level 2 [Member] | Best-efforts and mandatory commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments |  | (1,000,000.0) |
Recurring [Member] | Level 3 [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt securities collateralized by residential real estate | 3,900,000 | 3,900,000 | $ 3,900,000
Mortgage loans held for sale | 15,100,000 | 9,800,000 | $ 7,800,000
Mortgage servicing rights | 17,100,000 | 0 |
Recurring [Member] | Level 3 [Member] | Measurement Input, Prepayment Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Servicing Asset at Fair Value, Amount | 0.13 |  |
Recurring [Member] | Level 3 [Member] | Measurement Input, Discount Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Servicing Asset at Fair Value, Amount | 0.11 |  |
Recurring [Member] | Level 3 [Member] | Measurement Input, Default Rate [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Servicing Asset at Fair Value, Amount | 0.05 |  |
Recurring [Member] | Level 3 [Member] | Interest rate lock commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | 0 | 0 |
Recurring [Member] | Level 3 [Member] | Forward Sales Of MBS [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments | $ 0 | 0 |
Recurring [Member] | Level 3 [Member] | Best-efforts and mandatory commitments [Member] |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Derivatives not designated as hedging instruments |  | $ 0 |

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- Definition Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120238483&loc=d3e48678-111004 + Details
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