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Acquisitions (Details) $ in Thousands, $ in Millions, $ in Millions | Feb. 28, 2020 USD ($) | Feb. 28, 2020 AUD ($) | Aug. 16, 2019 USD ($) | Aug. 16, 2019 CAD ($) | Nov. 16, 2018 USD ($) | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($)
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Business Acquisition [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 585,772 | $ 584,469
General Dynamics Information Technology's Citizen Engagement Centers |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash payment to acquire business |  |  |  |  | $ 430,700 |  |
Goodwill |  |  |  |  | 184,600 |  |
Intangible assets acquired |  |  |  |  | $ 122,300 |  |
GT Hiring Solutions Inc |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash payment to acquire business |  |  | $ 6,200 | $ 8.2 |  |  |
Goodwill |  |  | 1,500 |  |  |  |
Intangible assets acquired |  |  | $ 2,700 |  |  |  |
Percentage of voting equity interests acquired at the acquisition date in the business combination |  |  | 100.00% |  |  |  |
Useful life |  |  | 7 years | 7 years |  |  |
InjuryNet |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash payment to acquire business | $ 3,700 | $ 5.6 |  |  |  |  |
Percentage of voting equity interests acquired at the acquisition date in the business combination | 100.00% | 100.00% |  |  |  |  |

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