Segment and Geographic Information - Net Revenues Based upon Source of Order by Geographic Area - Tabular Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 165,948	$ 132,735	$ 492,715	$ 417,931
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	91,018	88,380	267,437	272,750
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	23,594	17,148	84,448	57,177
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	8,806	8,101	20,009	23,215
Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	19,064	86	44,901	1,305
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	12,766	12,906	38,153	39,704
Asia / Pacific / Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 10,700	$ 6,114	$ 37,767	$ 23,780