SEGMENT REPORTING - Schedule of Reportable Segment Operating Performance (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2025		Sep. 30, 2024		Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenue									$ 213,158		$ 191,232		$ 189,681
Other costs of services (excluding depreciation and amortization)	$ 17,698	$ 16,733	$ 16,580	$ 15,576	$ 16,094	$ 15,287	$ 15,194	$ 13,942	66,587	[1]	60,517	[1]	54,811	[1]
Net income (loss) from continuing operations									5,618		(16,045)		(24,808)
Reportable Segment
Segment Reporting Information [Line Items]
Revenue									213,158		191,232		189,681
Other costs of services (excluding depreciation and amortization)									65,847		59,638		53,294
People operating expenses									62,936		56,140		59,203
Technology operating expenses									8,887		7,340		6,500
Other operating expenses									17,953		17,651		18,892
Other segment expenses									51,917		66,508		76,600
Net income (loss) from continuing operations									$ 5,618		$ (16,045)		$ (24,808)

[1] Refer to Note 3 for discussion of the change in the current and prior period presentation.