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Business combinations and disposal - Schedule of Assets and Liabilities Recorded in the Company's Financial Statements (Details) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 16, 2018 | Jun. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |
Goodwill |  |  | $ 584,469 | $ 399,882 | $ 402,976
General Dynamics Information Technology's Citizen Engagement Centers |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |
Cash consideration | $ 430,700 | $ 430,699 | 430,723 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |
Billed and unbilled receivables |  | 142,165 | 142,077 |  |
Property and equipment |  | 8,974 | 13,961 |  |
Other assets |  | 4,508 | 4,530 |  |
Intangible assets |  | 122,300 | 122,300 |  |
Total identifiable assets acquired |  | 277,947 | 282,868 |  |
Accounts payable and other liabilities |  | 31,862 | 36,785 |  |
Net identifiable assets acquired |  | 246,085 | 246,083 |  |
Goodwill |  | 184,614 | 184,640 |  |
Net assets acquired |  | $ 430,699 | 430,723 |  |
General Dynamics Information Technology's Citizen Engagement Centers | Scenario, Adjustment |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  |
Cash consideration |  |  | 24 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |  |
Billed and unbilled receivables |  |  | (88) |  |
Property and equipment |  |  | 4,987 |  |
Other assets |  |  | 22 |  |
Intangible assets |  |  | 0 |  |
Total identifiable assets acquired |  |  | 4,921 |  |
Accounts payable and other liabilities |  |  | 4,923 |  |
Net identifiable assets acquired |  |  | (2) |  |
Goodwill |  |  | 26 |  |
Net assets acquired |  |  | $ 24 |  |

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