Segment and Geographic Information - Net Revenues Based upon Source of Order by Geographic Area - Tabular Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 154,317	$ 178,366
North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	90,592	87,717
Rest of Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	24,832	39,422
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	5,699	5,413
Africa
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	7,511	17,210
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	14,898	13,408
Asia / Pacific / Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Total revenue	$ 10,785	$ 15,196