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, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 159,134	$ 148,401	$ 313,451	$ 326,767
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	88,398	86,572	178,990	174,321
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	23,850	21,432	48,682	60,854
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	5,641	5,789	11,340	11,202
Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	18,942	8,627	26,453	25,837
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	13,646	11,979	28,544	25,387
Asia / Pacific / Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 8,657	$ 14,002	$ 19,442	$ 29,166