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Goodwill and intangible assets - Schedule of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017
Components of intangible assets |  |
Cost | $ 139,359 | $ 142,093
Accumulated Amortization | 51,324 | 43,324
Intangible Assets, net | 88,035 | 98,769
Customer contracts and relationships |  |
Components of intangible assets |  |
Cost | 129,113 | 129,916
Accumulated Amortization | 42,683 | 33,457
Intangible Assets, net | 86,430 | 96,459
Technology-based intangible assets |  |
Components of intangible assets |  |
Cost | 5,750 | 7,664
Accumulated Amortization | 4,212 | 5,475
Intangible Assets, net | 1,538 | 2,189
Trademarks and trade names |  |
Components of intangible assets |  |
Cost | 4,496 | 4,513
Accumulated Amortization | 4,429 | 4,392
Intangible Assets, net | $ 67 | $ 121
Weighted Average |  |
Components of intangible assets |  |
Weighted average remaining life of assets not fully amortized | 11 years 11 months |
Weighted Average | Customer contracts and relationships |  |
Components of intangible assets |  |
Weighted average remaining life of assets not fully amortized | 12 years |
Weighted Average | Technology-based intangible assets |  |
Components of intangible assets |  |
Weighted average remaining life of assets not fully amortized | 5 years |
Weighted Average | Trademarks and trade names |  |
Components of intangible assets |  |
Weighted average remaining life of assets not fully amortized | 1 year 4 months |

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