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Acquisitions and Divestiture (Details) $ in Thousands, $ in Millions, $ in Millions |  |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 01, 2020 USD ($) | Feb. 28, 2020 USD ($) | Feb. 28, 2020 AUD ($) | Aug. 16, 2019 USD ($) | Aug. 16, 2019 CAD ($) | Nov. 16, 2018 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 586,757 |  | $ 584,469
Gain on sale of a business |  |  |  |  |  |  | $ 1,706 | $ 0 |
Q2 Administrators LLC |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from sale of subsidiary | $ 3,300 |  |  |  |  |  |  |  |
Gain on sale of a business | $ 1,700 |  |  |  |  |  |  |  |
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 |  |  |  | 2,800 |  |  |  |  |
Intangible assets acquired |  |  |  | $ 1,400 |  |  |  |  |
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 |  | $ 3,400 | $ 5.2 |  |  |  |  |  |
Percentage of voting equity interests acquired at the acquisition date in the business combination |  | 100.00% | 100.00% |  |  |  |  |  |

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