REVENUE RECOGNITION - Narrative (Details) - USD ($)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Revenue recognized included in contract liability balance at the beginning of the period	$ 19,300,000	$ 10,900,000
Unbilled receivables	900,000	1,700,000
Revenue, remaining performance obligation, amount	18,300,000	23,100,000
Impairment losses recognized in capitalized contract costs	0	0
Selling and Marketing
Disaggregation of Revenue [Line Items]
Amortization of capitalized contract costs	1,500,000	1,300,000
Other Current and Non-Current Assets
Disaggregation of Revenue [Line Items]
Capitalized contract costs	2,600,000	2,400,000
2025-10-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 1,000,000
Revenue, remaining performance obligation, amount period
2023-10-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount		$ 21,400,000
Revenue, remaining performance obligation, amount period		1 year
2024-10-01
Disaggregation of Revenue [Line Items]
Revenue, remaining performance obligation, amount	$ 17,400,000	$ 1,800,000
Revenue, remaining performance obligation, amount period	1 year
Minimum
Disaggregation of Revenue [Line Items]
Estimated useful lives of intangible assets (in years)	3 years
Minimum | Software
Disaggregation of Revenue [Line Items]
Estimated useful lives of intangible assets (in years)	1 year
Maximum
Disaggregation of Revenue [Line Items]
Estimated useful lives of intangible assets (in years)	7 years
Maximum | Software
Disaggregation of Revenue [Line Items]
Estimated useful lives of intangible assets (in years)	3 years