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Business combinations and disposals - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019
Components of intangible assets |  |
Cost | $ 245,397 | $ 260,551
Accumulated Amortization | 99,504 | 81,301
Intangible Assets, net | 145,893 | 179,250
Customer contracts and relationships |  |
Components of intangible assets |  |
Cost | 235,287 | 250,455
Accumulated Amortization | 90,302 | 72,430
Intangible Assets, net | 144,985 | 178,025
Technology-based intangible assets |  |
Components of intangible assets |  |
Cost | 5,631 | 5,613
Accumulated Amortization | 4,723 | 4,405
Intangible Assets, net | 908 | 1,208
Trademarks and trade names |  |
Components of intangible assets |  |
Cost | 4,479 | 4,483
Accumulated Amortization | 4,479 | 4,466
Intangible Assets, net | $ 0 | $ 17
Weighted Average |  |
Components of intangible assets |  |
Weighted average remaining life of assets not fully amortized | 9 years |
Weighted Average | Customer contracts and relationships |  |
Components of intangible assets |  |
Weighted average remaining life of assets not fully amortized | 9 years |
Weighted Average | Technology-based intangible assets |  |
Components of intangible assets |  |
Weighted average remaining life of assets not fully amortized | 3 years 1 month 6 days |

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