REVENUE RECOGNITION - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Disaggregation of Revenue [Line Items]
Revenue recognized included in contract liability balance at the beginning of the period	$ 3,600,000	$ 2,600,000	$ 19,900,000	$ 16,300,000
Unbilled receivables	1,900,000		1,900,000		$ 400,000
Allowance for credit losses	2,500,000		2,500,000		2,100,000
Amortization of costs capitalized to obtain revenue contracts			1,394,000	1,247,000
Impairment losses recognized on contract costs			0	0
Selling and marketing
Disaggregation of Revenue [Line Items]
Amortization of costs capitalized to obtain revenue contracts	500,000	$ 500,000	1,400,000	$ 1,200,000
Other Current and Non-current Assets
Disaggregation of Revenue [Line Items]
Contract costs	$ 3,300,000		$ 3,300,000		$ 2,700,000
Software and hardware
Disaggregation of Revenue [Line Items]
Invoice payment period (no more than)			60 days
Services and other
Disaggregation of Revenue [Line Items]
Invoice payment period (no more than)			60 days
Minimum
Disaggregation of Revenue [Line Items]
Estimated useful lives of intangible assets (in years)	3 years		3 years
Revenue, remaining performance obligation, amount period	13 months		13 months
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
Revenue, remaining performance obligation, amount period	36 months		36 months
Maximum | Software
Disaggregation of Revenue [Line Items]
Estimated useful lives of intangible assets (in years)	3 years		3 years