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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Summary of Contractual Delinquencies of Loans that were Modified to Borrowers Experiencing Financial Difficulty (Details) - Contractual Delinquencies of Loans that were Modified to Borrowers [Member] - USD ($) $ in Thousands | Sep. 30, 2025 | Sep. 30, 2024
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Financing Receivable Recorded Investment [Line Items] |  |  |  |
Contractual delinquencies of loans | $ 30,467 | [1] | $ 19,979 | [2]
Small Loans [Member] |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Contractual delinquencies of loans | 6,366 | [1] | 3,639 | [2]
Large Loans [Member] |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Contractual delinquencies of loans | 24,101 | [1] | 16,340 | [2]
Financing Receivables, Current [Member] |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Contractual delinquencies of loans | 22,662 |  | 16,373 |
Financing Receivables, Current [Member] | Small Loans [Member] |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Contractual delinquencies of loans | 4,269 |  | 2,978 |
Financing Receivables, Current [Member] | Large Loans [Member] |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Contractual delinquencies of loans | 18,393 |  | 13,395 |
Financing Receivables, 30 - 89 Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Contractual delinquencies of loans | 3,933 |  | 2,075 |
Financing Receivables, 30 - 89 Days Past Due [Member] | Small Loans [Member] |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Contractual delinquencies of loans | 917 |  | 405 |
Financing Receivables, 30 - 89 Days Past Due [Member] | Large Loans [Member] |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Contractual delinquencies of loans | 3,016 |  | 1,670 |
Financing Receivables, 90+ Days Past Due [Member] |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Contractual delinquencies of loans | 3,872 |  | 1,531 |
Financing Receivables, 90+ Days Past Due [Member] | Small Loans [Member] |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Contractual delinquencies of loans | 1,180 |  | 256 |
Financing Receivables, 90+ Days Past Due [Member] | Large Loans [Member] |  |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |  |
Contractual delinquencies of loans | $ 2,692 |  | $ 1,275 |
[1] | Excludes modified finance receivables that subsequently charged of f of $2.3 million and $0.9 million i n large and small loans, respectively
[2] | Excludes modified finance receivables that subsequently charge d off of $1.2 million and $0.2 million i n large and small loans, respectively.

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