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Business combinations and disposal - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018
Components of intangible assets |  |
Cost | $ 260,551 | $ 139,359
Accumulated Amortization | 81,301 | 51,324
Intangible Assets, net | 179,250 | 88,035
Customer contracts and relationships |  |
Components of intangible assets |  |
Cost | 250,455 | 129,113
Accumulated Amortization | 72,430 | 42,683
Intangible Assets, net | 178,025 | 86,430
Technology-based intangible assets |  |
Components of intangible assets |  |
Cost | 5,613 | 5,750
Accumulated Amortization | 4,405 | 4,212
Intangible Assets, net | 1,208 | 1,538
Trademarks and trade names |  |
Components of intangible assets |  |
Cost | 4,483 | 4,496
Accumulated Amortization | 4,466 | 4,429
Intangible Assets, net | $ 17 | $ 67
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 1 month 6 days |
Weighted Average | Technology-based intangible assets |  |
Components of intangible assets |  |
Weighted average remaining life of assets not fully amortized | 4 years 1 month 6 days |
Weighted Average | Trademarks and trade names |  |
Components of intangible assets |  |
Weighted average remaining life of assets not fully amortized | 3 months 18 days |

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