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Business combinations and disposals - Schedule of Assets and Liabilities Recorded in the Company's Financial Statements (Details) - USD ($) $ in Thousands |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 16, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |
Goodwill |  | $ 593,129 | $ 584,469 | $ 399,882
General Dynamics Information Technology's Citizen Engagement Centers |  |  |  |
Business Combination, Consideration Transferred |  |  |  |
Cash consideration | $ 430,700 | 430,723 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net [Abstract] |  |  |  |
Billed and unbilled receivables |  | 142,077 |  |
Property and equipment |  | 13,961 |  |
Other assets |  | 4,530 |  |
Intangible assets |  | 122,300 |  |
Total identifiable assets acquired |  | 282,868 |  |
Accounts payable and other liabilities |  | 36,785 |  |
Net identifiable assets acquired |  | 246,083 |  |
Goodwill |  | 184,640 |  |
Net assets acquired |  | $ 430,723 |  |

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- Definition Amount of assets acquired at the acquisition date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
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