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Goodwill and Intangible Assets - Intangible Assets Subject to Amortization (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 1,100 $ 2,061 $ 3,255
Gross Carrying Amount 72,706 70,760  
Accumulated Amortization (71,789) (68,743)  
Intangible Assets, Net, Total $ 917 $ 2,017  
Weighted Average Life in Years 5 years 5 years  
Completed technology      
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 500 $ 500 1,027
Gross Carrying Amount 69,706 67,760  
Accumulated Amortization (69,289) (66,843)  
Intangible Assets, Net, Total $ 417 $ 917  
Weighted Average Life in Years 5 years 5 years  
Customer contracts and relationships      
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 600 $ 1,561 2,082
Gross Carrying Amount 3,000 3,000  
Accumulated Amortization (2,500) (1,900)  
Intangible Assets, Net, Total $ 500 $ 1,100  
Weighted Average Life in Years 5 years 5 years  
Non-compete agreements      
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 0 $ 0 $ 146
Weighted Average Life in Years 2 years