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Segment and Geographic Information - Net Revenues Based upon Source of Order by Geographic Area - Tabular Disclosure (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenue $ 665,072 $ 555,498 $ 513,703
North America      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenue 359,417 361,105 323,982
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenue 355,100 358,200 320,800
Europe      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenue 109,856 79,005 77,266
United Kingdom      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenue 26,764 30,258 31,539
Africa      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenue 65,092 1,331 688
China      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenue 51,787 53,867 45,743
Asia / Pacific / Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Total revenue $ 52,156 $ 29,932 $ 34,485