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REVENUE RECOGNITION - Narrative (Details) - USD ($) | 12 Months Ended
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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 |

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