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Summary of Significant Accounting Policies - Disaggregated Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Concentration Risk [Line Items]
Revenue	$ 370,239	$ 317,862	$ 224,124
Revenue earned over time
Concentration Risk [Line Items]
Revenue	331,012	273,820	157,567
Revenue earned at a point in time
Concentration Risk [Line Items]
Revenue	39,227	44,042	66,557
Fixed-Price Contract | Revenue earned over time
Concentration Risk [Line Items]
Revenue			25,843
Software and Services
Concentration Risk [Line Items]
Revenue	232,967	193,402	114,433
Software and Services | Revenue earned over time
Concentration Risk [Line Items]
Revenue	215,071	173,368	76,367
Software and Services | Revenue earned at a point in time
Concentration Risk [Line Items]
Revenue	17,896	20,034	38,066
Merchant Services
Concentration Risk [Line Items]
Revenue	137,342	124,481	111,870
Merchant Services | Revenue earned over time
Concentration Risk [Line Items]
Revenue	115,982	100,488	83,203
Merchant Services | Revenue earned at a point in time
Concentration Risk [Line Items]
Revenue	21,360	23,993	28,667
Other
Concentration Risk [Line Items]
Revenue	(70)	(21)	(2,179)
Other | Revenue earned over time
Concentration Risk [Line Items]
Revenue	(41)	(36)	(2,003)
Other | Revenue earned at a point in time
Concentration Risk [Line Items]
Revenue	(29)	15	(176)
Software and related services revenue
Concentration Risk [Line Items]
Revenue	184,031	154,808	87,590
Software and related services revenue | Software and Services
Concentration Risk [Line Items]
Revenue	170,895	142,202	75,736
Software and related services revenue | Merchant Services
Concentration Risk [Line Items]
Revenue	13,177	12,641	11,872
Software and related services revenue | Other
Concentration Risk [Line Items]
Revenue	(41)	(35)	(18)
Payments revenue
Concentration Risk [Line Items]
Revenue	166,854	144,452	119,681
Payments revenue | Software and Services
Concentration Risk [Line Items]
Revenue	51,834	40,951	29,451
Payments revenue | Merchant Services
Concentration Risk [Line Items]
Revenue	115,049	103,509	92,325
Payments revenue | Other
Concentration Risk [Line Items]
Revenue	(29)	(8)	(2,095)
Other revenue
Concentration Risk [Line Items]
Revenue	19,354	18,602	16,853
Other revenue | Software and Services
Concentration Risk [Line Items]
Revenue	10,238	10,249	9,246
Other revenue | Merchant Services
Concentration Risk [Line Items]
Revenue	9,116	8,331	7,673
Other revenue | Other
Concentration Risk [Line Items]
Revenue	$ 0	$ 22	$ (66)

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-SubTopic 310
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