LOANS AND LEASES, NET - Allowance for Loan Losses and Recorded Investment in Loans (Details) - USD ($) $ in Thousands	12 Months Ended
Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 71,765	$ 96,855	$ 63,796
Provision for credit loss	56,545	57,678	109,336
Charge-offs	(90,894)	(95,245)	(83,932)
Recoveries	15,903	12,477	7,655
Ending balance	53,319	71,765	96,855
Unfunded Loan Commitment
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	695	272	366
Provision for credit loss	229	423	(94)
Charge-offs	0	0	0
Recoveries	0	0	0
Ending balance	924	695	272
Total Committed Loans
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	72,460	97,127	64,162
Provision for credit loss	56,774	58,101	109,242
Charge-offs	(90,894)	(95,245)	(83,932)
Recoveries	15,903	12,477	7,655
Ending balance	54,243	72,460	97,127
National Lending \| Term lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	30,394	25,686	24,621
Provision for credit loss	11,728	20,558	10,541
Charge-offs	(16,977)	(18,193)	(11,295)
Recoveries	3,200	2,343	1,819
Ending balance	28,345	30,394	25,686
National Lending \| Asset-based lending
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,356	2,738	1,050
Provision for credit loss	11,855	(1,637)	4,005
Charge-offs	(5,611)	0	(2,873)
Recoveries	50	255	556
Ending balance	7,650	1,356	2,738
National Lending \| Factoring
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	5,757	6,566	6,556
Provision for credit loss	(668)	1,420	1,523
Charge-offs	(1,479)	(2,453)	(1,545)
Recoveries	709	224	32
Ending balance	4,319	5,757	6,566
National Lending \| Lease financing
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,189	3,302	5,902
Provision for credit loss	1,240	(2,010)	(1,424)
Charge-offs	(1,426)	(287)	(1,479)
Recoveries	37	184	303
Ending balance	1,040	1,189	3,302
National Lending \| SBA/USDA
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	3,273	2,962	3,263
Provision for credit loss	4,100	1,065	(296)
Charge-offs	(2,649)	(755)	(43)
Recoveries	83	1	38
Ending balance	4,807	3,273	2,962
National Lending \| Other commercial finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	607	3,089	1,310
Provision for credit loss	(517)	(2,482)	1,779
Charge-offs	0	0	0
Recoveries	0	0	0
Ending balance	90	607	3,089
National Lending \| Commercial finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	42,576	46,980	44,152
Provision for credit loss	27,829	15,147	18,477
Charge-offs	(28,235)	(22,837)	(18,894)
Recoveries	4,081	3,286	3,245
Ending balance	46,251	42,576	46,980
National Lending \| Consumer finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	28,669	49,496	19,312
Provision for credit loss	6,497	19,395	55,034
Charge-offs	(30,938)	(41,628)	(26,297)
Recoveries	2,194	1,406	1,447
Ending balance	6,422	28,669	49,496
National Lending \| Tax services
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	2	2	5
Provision for credit loss	22,091	22,995	35,775
Charge-offs	(31,721)	(30,780)	(38,741)
Recoveries	9,628	7,785	2,963
Ending balance	0	2	2
National Lending \| Warehouse finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	518	377	327
Provision for credit loss	128	141	50
Charge-offs	0	0	0
Recoveries	0	0	0
Ending balance	646	518	377
National Lending \| Premium finance
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	0	2,637	1,450
Provision for credit loss	91	(1,767)	2,349
Charge-offs	(93)	(1,149)	(1,659)
Recoveries	2	279	497
Ending balance	$ 0	$ 0	$ 2,637

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 22
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476148/220-40-50-22

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