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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Sep. 30, 2021
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Cost | $ 128,617 | $ 55,517
Accumulated Amortization | 32,253 | 26,783
Net | $ 96,364 | $ 28,734
Completed technologies |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Weighted Average Amortization Period (in years) | 6 years 10 months 24 days | 6 years 7 months 6 days
Cost | $ 95,761 | $ 34,361
Accumulated Amortization | 16,542 | 13,311
Net | $ 79,219 | $ 21,050
Customer relationships |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Weighted Average Amortization Period (in years) | 4 years 8 months 12 days | 4 years 7 months 6 days
Cost | $ 25,168 | $ 20,168
Accumulated Amortization | 15,012 | 12,905
Net | $ 10,156 | $ 7,263
Trade names |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Weighted Average Amortization Period (in years) | 5 years | 4 years 8 months 12 days
Cost | $ 7,088 | $ 988
Accumulated Amortization | 691 | 567
Net | $ 6,397 | $ 421
Covenants not to compete |  |
Indefinite Lived Intangible Assets By Major Class [Line Items] |  |
Weighted Average Amortization Period (in years) | 3 years |
Cost | $ 600 |
Accumulated Amortization | 8 |
Net | $ 592 |

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