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LOANS AND LEASES, NET - Summary of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Mar. 31, 2026	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	$ 5,104,580		$ 4,665,006
Net deferred loan origination costs (fees)	3,261		(98)
Total gross loans and leases	5,107,841		4,664,908
Allowance for credit losses	(109,780)		(53,319)
Total loans and leases, net	4,998,061		4,611,589
National Lending \| Term lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	2,666,977		2,302,540
Allowance for credit losses	(41,471)	$ (33,744)	(28,345)	$ (29,376)	$ (26,219)	$ (30,394)
National Lending \| Asset-based lending
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	697,687		593,265
Allowance for credit losses	(10,816)	(11,969)	(7,650)	(7,335)	(2,030)	(1,356)
National Lending \| Factoring
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	220,026		217,501
Allowance for credit losses	(12,905)	(4,974)	(4,319)	(5,377)	(4,934)	(5,757)
National Lending \| Lease financing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	120,583		149,236
Allowance for credit losses	(1,099)	(838)	(1,040)	(1,130)	(1,243)	(1,189)
National Lending \| SBA/USDA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	567,986		511,488
Allowance for credit losses	(7,410)	(4,235)	(4,807)	(5,028)	(4,021)	(3,273)
National Lending \| Other commercial finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	49,510		149,939
Allowance for credit losses	(100)	(36)	(90)	(189)	(384)	(607)
National Lending \| Commercial finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	4,322,769		3,923,969
Allowance for credit losses	(73,801)	(55,796)	(46,251)	(48,435)	(38,831)	(42,576)
National Lending \| Consumer finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	99,430		93,319
Allowance for credit losses	(5,198)	(6,589)	(6,422)	(26,467)	(29,635)	(28,669)
National Lending \| Tax services
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	34,770		2,532
Allowance for credit losses	(30,133)	(35,289)	0	(30,429)	(33,781)	(2)
National Lending \| Warehouse finance
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total loans and leases	647,611		645,186
Allowance for credit losses	$ (648)	$ (605)	$ (646)	$ (664)	$ (643)	$ (518)