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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Cost $ 55,517 $ 55,517
Accumulated Amortization 29,232 26,783
Net $ 26,285 $ 28,734
Completed technologies    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Weighted Average Amortization Period 6 years 7 months 6 days 6 years 7 months 6 days
Cost $ 34,361 $ 34,361
Accumulated Amortization 14,680 13,311
Net $ 19,681 $ 21,050
Customer relationships    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Weighted Average Amortization Period 4 years 7 months 6 days 4 years 7 months 6 days
Cost $ 20,168 $ 20,168
Accumulated Amortization 13,953 12,905
Net $ 6,215 $ 7,263
Trade names    
Indefinite Lived Intangible Assets By Major Class [Line Items]    
Weighted Average Amortization Period 4 years 8 months 12 days 4 years 8 months 12 days
Cost $ 988 $ 988
Accumulated Amortization 599 567
Net $ 389 $ 421