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Revenue - Disaggregation of Revenue (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Disaggregation of Revenue [Line Items]      
Total revenues $ 308,632 $ 279,271 $ 254,203
North America, primarily United States      
Disaggregation of Revenue [Line Items]      
Total revenues 227,923 213,487 184,022
Europe, Middle East & Africa      
Disaggregation of Revenue [Line Items]      
Total revenues 46,024 40,076 39,896
Rest of world      
Disaggregation of Revenue [Line Items]      
Total revenues 34,685 25,708 30,285
Transferred at a point in time      
Disaggregation of Revenue [Line Items]      
Total revenues 274,960 253,371 231,387
Transferred over time      
Disaggregation of Revenue [Line Items]      
Total revenues $ 33,672 $ 25,900 $ 22,816