NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narrative (Details)	3 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($) institution $ / shares	Sep. 30, 2025 USD ($) reportingUnit institution segment $ / shares	Sep. 30, 2024 USD ($) $ / shares	Sep. 30, 2023 USD ($)
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Number of financial services organizations, leading marketplace and financial technology brands (more than) | institution	7,000	7,000
Foreign currency transaction adjustment		$ 400,000	$ 1,000,000	$ (700,000)
Unbilled receivables	$ 2,000,000	2,000,000	400,000
Restructuring costs		840,000	1,762,000	2,114,000
Write-offs of allowance for doubtful accounts		100,000	200,000	100,000
Allowance for doubtful accounts receivable	2,800,000	2,800,000	2,100,000	1,500,000
Additions to the allowance for credit loss		800,000	700,000	700,000
Depreciation expense		1,300,000	1,800,000	1,700,000
Repairs and maintenance expenses		100,000	100,000	100,000
Impairment or long-lived assets		0	0	0
Capitalized software development costs	0	0	0	0
Amortization expense for capitalized software development costs		0	0	0
Capitalized software development costs for internal use	900,000	900,000	700,000	700,000
Amortization expense for capitalized software development costs for internal use		$ 900,000	900,000	700,000
Number of operating segments | segment		1
Number of reporting units | reportingUnit		1
Goodwill impairment	$ 0	$ 0	0	0
Impairment to intangible assets		$ 0	$ 0	0
Common stock, par value (in dollars per share) | $ / shares	$ 0.001	$ 0.001	$ 0.001
Trading-day average stock price period		20 days
Advertising costs		$ 1,200,000	$ 1,400,000	1,200,000
Revenue		179,691,000	172,083,000	172,552,000
Operating expenses		(162,901,000)	(169,852,000)	(156,988,000)
Operating income		$ 16,790,000	2,231,000	$ 15,564,000
Total Adjustments
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Revenue			1,400,000
Operating expenses			500,000
Operating income			$ 1,900,000
Minimum
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	3 years	3 years
Maximum
Nature Of Operations And Summary Of Significant Accounting Policies [Line Items]
Property and equipment, estimated useful lives	7 years	7 years