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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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Amortized cost of financing receivable with payment default in current period and modified within previous 12 months preceding payment default for debtor experiencing financial difficulty.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans and leases that were sold during the reporting period. This element refers to the gain (loss) and not to the cash proceeds of the sales. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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LOANS AND LEASES, NET - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
LOANS AND LEASES, NET - Narrative (Details) - USD ($)	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Sep. 30, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held for sale			$ 2,748,526,000	$ 1,925,438,000
Proceeds from sale, loan, held-for-sale			2,910,000,000	2,160,000,000
Secondary market revenue			21,700,000	26,900,000
Loans and leases	$ 5,107,841,000		5,107,841,000		$ 4,664,908,000
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	3,379,133,000		3,379,133,000		3,615,399,000
Pass \| Asset Pledged as Collateral
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	92,400,000		92,400,000		107,700,000
Consumer finance portfolio segment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	99,400,000		99,400,000		93,300,000
Tax services loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and leases	34,800,000		34,800,000		$ 2,500,000
National Lending \| Commercial Finance and Consumer Finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Originated loans held for sale			2,750,000,000	1,930,000,000
National Lending \| Commercial finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDRs subsequent default, recorded investment			3,000,000.0	7,200,000
National Lending \| Commercial finance \| 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDRs subsequent default, recorded investment			500,000
National Lending \| Commercial finance \| 60-89 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDRs subsequent default, recorded investment			2,500,000	0
National Lending \| Commercial finance \| Term Extensions and Reduced Payments
Accounts, Notes, Loans and Financing Receivable [Line Items]
TDRs subsequent default, recorded investment	$ 0	$ 0	$ 3,000,000.0	$ 9,100,000