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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
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 off of $2.3 million and $0.9 million in large and small loans, respectively
[2] Excludes modified finance receivables that subsequently charged off of $1.2 million and $0.2 million in large and small loans, respectively.