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Goodwill and intangible assets - Schedule of Goodwill (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Jul. 01, 2018 | Sep. 30, 2018 | Sep. 30, 2017
Changes in goodwill |  |  |
Balance at the beginning of the period |  | $ 402,976,000 | $ 397,558,000
Foreign currency translation |  | (3,094,000) | 3,074,000
Balance at the end of the period |  | 399,882,000 | 402,976,000
Impairment of goodwill related to continuing operations | $ 0 | 0 |
Ascend Management Innovations LLC |  |  |
Changes in goodwill |  |  |
Balance at the end of the period |  | 17,997,000 |
Ascend Management Innovations LLC and Assessments Australia |  |  |
Changes in goodwill |  |  |
Adjustment to goodwill acquired |  |  | (486,000)
Revitalised |  |  |
Changes in goodwill |  |  |
Goodwill, Acquired During Period |  |  | 2,830,000
Health Services |  |  |
Changes in goodwill |  |  |
Balance at the beginning of the period |  | 128,460,000 | 123,679,000
Foreign currency translation |  | (1,719,000) | 2,508,000
Balance at the end of the period |  | 126,741,000 | 128,460,000
Health Services | Ascend Management Innovations LLC |  |  |
Changes in goodwill |  |  |
Adjustment to goodwill acquired |  |  | (557,000)
Health Services | Revitalised |  |  |
Changes in goodwill |  |  |
Goodwill, Acquired During Period |  |  | 2,830,000
U.S. Federal Services |  |  |
Changes in goodwill |  |  |
Balance at the beginning of the period |  | 228,148,000 | 228,148,000
Adjustment to goodwill acquired |  |  | 0
Foreign currency translation |  | 0 | 0
Balance at the end of the period |  | 228,148,000 | 228,148,000
U.S. Federal Services | Revitalised |  |  |
Changes in goodwill |  |  |
Goodwill, Acquired During Period |  |  | 0
Human Services |  |  |
Changes in goodwill |  |  |
Balance at the beginning of the period |  | 46,368,000 | 45,731,000
Foreign currency translation |  | (1,375,000) | 566,000
Balance at the end of the period |  | $ 44,993,000 | 46,368,000
Human Services | Assessments Australia |  |  |
Changes in goodwill |  |  |
Adjustment to goodwill acquired |  |  | 71,000
Human Services | Revitalised |  |  |
Changes in goodwill |  |  |
Goodwill, Acquired During Period |  |  | $ 0

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