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Mortgage Loans - Mortgage Loans Held for Sale Textual (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Loans Receivable [Line Items] |  |  |
Payments for Origination of Mortgage Loans Held-for-sale | $ 19,500.0 | $ 16,000.0 | $ 12,200.0
Proceeds from Sale of Mortgage Loans Held-for-sale | 18,900.0 | 15,500.0 | 11,800.0
Net gain on sales of loans | 561.7 | 619.1 | $ 437.2
Mortgage loans held for sale | 2,386.0 | 2,027.3 |
Mortgage loans held for sale, principal amount | 2,510.0 | 1,970.0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Mortgage loans held for sale | 2,356.1 | 2,009.4 |
Loan Origination Commitments [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Derivative, Notional Amount | 532.4 | 834.6 |
Loan Origination Commitments [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | $ 4.8 | 1.1 |
Other Customer [Member] | Mortgage Loans | Customer Concentration Risk |  |  |
Loans Receivable [Line Items] |  |  |
Concentration Risk, Percentage | 30.00% |  |
Loans Sold to FNMA or securities backed by GNMA [Member] | Mortgage Loans | Customer Concentration Risk |  |  |
Loans Receivable [Line Items] |  |  |
Concentration Risk, Percentage | 62.00% |  |
Hedging Instruments Related To IRLCs [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Derivative, Notional Amount | $ 3,800.0 | 1,400.0 |
Hedging Instruments Related To IRLCs [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Interest Rate Derivative Instruments Not Designated as Hedging Instruments at Fair Value, Net | 317.8 | 8.5 |
Uncommitted Loans [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Mortgage loans held for sale | $ 1,600.0 | $ 1,300.0 |

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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI https://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI https://asc.fasb.org/extlink&oid=120400993&loc=SL114874131-224263 + Details
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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 https://asc.fasb.org/extlink&oid=124259787&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 https://asc.fasb.org/extlink&oid=124265262&loc=d3e48678-111004 + Details
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