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Goodwill and intangible assets (Tables) | 12 Months Ended
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Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of changes in the carrying amount of goodwill | Changes in goodwill for the years ended September 30, 2018 and 2017 are as follows (in thousands):
| Health Services |  | U.S. Federal Services |  | Human Services |  | Total
Balance as of September 30, 2016 | $ | 123,679 |  |  | $ | 228,148 |  |  | $ | 45,731 |  |  | $ | 397,558 |
Adjustment to goodwill acquired with Ascend and Assessments Australia, respectively | (557 | ) |  | — |  |  | 71 |  |  | (486 | )
Acquisition of Revitalised | 2,830 |  |  | — |  |  | — |  |  | 2,830 |
Foreign currency translation | 2,508 |  |  | — |  |  | 566 |  |  | 3,074 |
Balance as of September 30, 2017 | 128,460 |  |  | 228,148 |  |  | 46,368 |  |  | 402,976 |
Foreign currency translation | (1,719 | ) |  | — |  |  | (1,375 | ) |  | (3,094 | )
Balance as of September 30, 2018 | $ | 126,741 |  |  | $ | 228,148 |  |  | $ | 44,993 |  |  | $ | 399,882 |
Schedule of components of intangible assets | The following table sets forth the components of intangible assets (in thousands):
| As of September 30, 2018 |  | As of September 30, 2017
| Cost |  | Accumulated Amortization |  | Intangible Assets, net |  | Cost |  | Accumulated Amortization |  | Intangible Assets, net
Customer contracts and relationships | $ | 129,113 |  |  | $ | 42,683 |  |  | $ | 86,430 |  |  | $ | 129,916 |  |  | $ | 33,457 |  |  | $ | 96,459 |
Technology-based intangible assets | 5,750 |  |  | 4,212 |  |  | 1,538 |  |  | 7,664 |  |  | 5,475 |  |  | 2,189 |
Trademarks and trade names | 4,496 |  |  | 4,429 |  |  | 67 |  |  | 4,513 |  |  | 4,392 |  |  | 121 |
Total | $ | 139,359 |  |  | $ | 51,324 |  |  | $ | 88,035 |  |  | $ | 142,093 |  |  | $ | 43,324 |  |  | $ | 98,769 |
Schedule of estimated future amortization expense | The estimated future amortization expense for the next five years for the intangible assets held by the Company as of September 30, 2018, is as follows (in thousands):
2019 | $ | 9,377 |
2020 | 8,279 |
2021 | 7,416 |
2022 | 7,354 |
2023 | 7,339 |

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