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Business combinations and disposal Business combinations and disposals - Assessments Australia (Details) $ in Thousands | Dec. 15, 2015 USD ($) company | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($)
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Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 399,882 | $ 402,976 | $ 397,558
Assessments Australia |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Share capital acquired (as a percent) | 100.00% |  |  |
Number of businesses acquired | company | 3 |  |  |
Cash consideration | $ 2,600 |  |  |
Contingent consideration, liability, current | 500 | 400 |  |
Intangible assets | 400 |  |  |
Human Services |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill |  | $ 44,993 | $ 46,368 | $ 45,731
Human Services | Assessments Australia |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 3,000 |  |  |
Customer relationships | Assessments Australia |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Useful life | 6 years |  |  |

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