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Mortgage Loans - Mortgage Loans Held for Sale Textual (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Loans Receivable [Line Items] |  |  |
Mortgage loans held for sale | $ 2,566.5 | $ 2,477.5 |
Mortgage loans held for sale, principal amount | 2,670.0 | 2,490.0 |
Payments for Origination of Mortgage Loans Held-for-sale | 23,700.0 | 24,000.0 | $ 21,200.0
Proceeds from Sale of Mortgage Loans Held-for-sale | 23,500.0 | 24,000.0 | 21,000.0
Net gain on sales of loans | 566.3 | 589.9 | $ 538.4
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Mortgage loans held for sale | 2,504.7 | 2,421.2 |
Loan Origination Commitments [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Derivative, Notional Amount | 677.5 | 637.9 |
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 | $ 1.9 | 2.4 |
Other Customer [Member] | Mortgage Loans | Customer Concentration Risk |  |  |
Loans Receivable [Line Items] |  |  |
Concentration Risk, Percentage | 27.00% |  |
Loans Sold to FNMA or securities backed by GNMA [Member] | Mortgage Loans | Customer Concentration Risk |  |  |
Loans Receivable [Line Items] |  |  |
Concentration Risk, Percentage | 71.00% |  |
Uncommitted Loans [Member] |  |  |
Loans Receivable [Line Items] |  |  |
Mortgage loans held for sale | $ 2,300.0 | $ 1,900.0 |

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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 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(h)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + 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/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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- Definition The amount of cash paid for the origination of mortgages that are held for sale. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 21 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-21 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 25 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-25 + Details
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