Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Total Revenue	$ 79,079	$ 70,338	$ 229,526	$ 206,102
North America, primarily the United States
Disaggregation of Revenue [Line Items]
Total Revenue	56,965	52,603	167,406	157,513
Europe, Middle East & Africa
Disaggregation of Revenue [Line Items]
Total Revenue	12,543	11,027	34,769	29,428
Rest of world
Disaggregation of Revenue [Line Items]
Total Revenue	9,571	6,708	27,351	19,161
Transferred at a point in time
Disaggregation of Revenue [Line Items]
Total Revenue	70,333	63,674	203,665	186,739
Transferred over time
Disaggregation of Revenue [Line Items]
Total Revenue	$ 8,746	$ 6,664	$ 25,861	$ 19,363