REVENUE RECOGNITION - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue recognized included in contract liability balance at the beginning of the period	$ 2,600,000	$ 1,800,000	$ 16,300,000	$ 11,700,000
Unbilled receivables	300,000		300,000		$ 900,000
Allowance for credit losses	2,500,000		2,500,000		1,500,000
Amortization of costs capitalized to obtain revenue contracts			1,247,000	1,091,000
Impairment losses recognized on contract costs			0	0
Selling and marketing
Disaggregation of Revenue [Line Items]
Amortization of costs capitalized to obtain revenue contracts	400,000	$ 400,000	1,200,000	$ 1,100,000
Other Current and Non-current Assets
Disaggregation of Revenue [Line Items]
Contract costs	$ 2,300,000		$ 2,300,000		$ 2,600,000
Minimum
Disaggregation of Revenue [Line Items]
Estimated useful lives of intangible assets (in years)	3 years		3 years
Minimum | Software
Disaggregation of Revenue [Line Items]
Estimated useful lives of intangible assets (in years)	1 year		1 year
Maximum
Disaggregation of Revenue [Line Items]
Estimated useful lives of intangible assets (in years)	7 years		7 years
Maximum | Software
Disaggregation of Revenue [Line Items]
Estimated useful lives of intangible assets (in years)	3 years		3 years