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Intangible Assets, Net - Components of Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 1,021,879 | $ 245,397
Accumulated Amortization | 142,711 | 99,504
Intangible Assets, Net | 879,168 | 145,893
Customer contracts and relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 928,069 | 235,287
Accumulated Amortization | 131,081 | 90,302
Intangible Assets, Net | 796,988 | 144,985
VES Provider network |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 57,000 | 0
Accumulated Amortization | 1,583 | 0
Intangible Assets, Net | 55,417 | 0
Technology-based intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 32,307 | 5,631
Accumulated Amortization | 5,544 | 4,723
Intangible Assets, Net | 26,763 | 908
Trademarks and trade names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 4,503 | 4,479
Accumulated Amortization | 4,503 | 4,479
Intangible Assets, Net | $ 0 | $ 0

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