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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Mar. 31, 2026 | Mar. 31, 2025
Concentration Risk [Line Items] |  |  |  |
Total revenue | $ 57,518 | $ 54,135 | $ 110,189 | $ 106,356
Revenue earned over time |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 49,649 | 47,514 | 97,297 | 94,914
Revenue earned at a point in time |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 7,869 | 6,621 | 12,892 | 11,442
Software and related services revenue |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 40,677 | 37,679 | 76,359 | 74,283
Proprietary payments revenue |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 14,523 | 14,058 | 28,998 | 27,493
Other revenue |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | $ 2,318 | $ 2,398 | $ 4,832 | $ 4,580

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