Segment and Geographic Information - Net Revenues Based upon Source of Order by Geographic Area - Tabular Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 148,401	$ 145,544	$ 326,767	$ 285,196
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	87,484	94,283	176,419	184,366
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	21,432	19,745	60,854	40,028
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	5,789	6,809	11,202	15,121
Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	8,627	672	25,837	1,219
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	11,979	13,757	25,387	26,798
Asia / Pacific / Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 13,090	$ 10,278	$ 27,068	$ 17,664