REVENUE RECOGNITION - Narrative (Details) - USD ($)	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2023
Disaggregation of Revenue [Line Items]
Revenue recognized included in contract liability balance at the beginning of the period	$ 9,100,000	$ 6,600,000
Unbilled receivables	600,000		$ 900,000
Impairment losses recognized on contract costs	0	0
Selling and marketing
Disaggregation of Revenue [Line Items]
Contract costs included in selling and marketing expenses	400,000	$ 400,000
Other Current and Non-current Assets
Disaggregation of Revenue [Line Items]
Contract costs	$ 2,400,000		$ 2,600,000
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