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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Disaggregated Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2025 | Mar. 31, 2024
Concentration Risk [Line Items] |  |  |  |
Total revenue | $ 63,059 | $ 57,968 | $ 124,750 | $ 113,022
Public Sector |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 52,405 | 47,097 | 101,190 | 90,595
Healthcare |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 10,857 | 11,053 | 24,028 | 22,633
Other |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | (203) | (182) | (468) | (206)
Revenue earned over time |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 56,438 | 53,852 | 113,305 | 106,682
Revenue earned over time | Public Sector |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 45,992 | 42,961 | 91,657 | 84,366
Revenue earned over time | Healthcare |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 10,648 | 11,035 | 22,116 | 22,475
Revenue earned over time | Other |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | (202) | (144) | (468) | (159)
Revenue earned at a point in time |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 6,621 | 4,116 | 11,445 | 6,340
Revenue earned at a point in time | Public Sector |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 6,413 | 4,136 | 9,533 | 6,229
Revenue earned at a point in time | Healthcare |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 209 | 18 | 1,912 | 158
Revenue earned at a point in time | Other |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | (1) | (38) | 0 | (47)
Software and related services revenue |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 46,223 | 41,897 | 91,898 | 82,000
Software and related services revenue | Public Sector |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 35,956 | 31,385 | 69,159 | 60,368
Software and related services revenue | Healthcare |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 10,469 | 10,656 | 23,207 | 21,791
Software and related services revenue | Other |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | (202) | (144) | (468) | (159)
Proprietary payments revenue |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 14,141 | 13,572 | 27,652 | 26,249
Proprietary payments revenue | Public Sector |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 14,058 | 13,511 | 27,493 | 26,141
Proprietary payments revenue | Healthcare |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 84 | 67 | 159 | 123
Proprietary payments revenue | Other |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | (1) | (6) | 0 | (15)
Other revenue |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 2,695 | 2,499 | 5,200 | 4,773
Other revenue | Public Sector |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 2,391 | 2,201 | 4,538 | 4,086
Other revenue | Healthcare |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | 304 | 330 | 662 | 719
Other revenue | Other |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Total revenue | $ 0 | $ (32) | $ 0 | $ (32)

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