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Business combinations and disposals - Schedule of Goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2020 | Sep. 30, 2019
Changes in goodwill |  |
Balance at the beginning of the period | $ 584,469,000 | $ 399,882,000
Goodwill acquired through acquisition | 7,652,000 |
Other |  | 372,000
Disposal of Q2 Administrators, LLC | (899,000) |
Foreign currency translation | 1,907,000 | (1,772,000)
Balance at the end of the period | 593,129,000 | 584,469,000
Goodwill impairment loss | 0 |
General Dynamics Information Technology's Citizen Engagement Centers |  |
Changes in goodwill |  |
Goodwill acquired through acquisition |  | 184,640,000
Balance at the end of the period | 184,640,000 |
GT Hiring Solutions |  |
Changes in goodwill |  |
Goodwill acquired through acquisition |  | 1,347,000
U.S. Services |  |
Changes in goodwill |  |
Balance at the beginning of the period | 164,472,000 | 139,588,000
Goodwill acquired through acquisition | 0 |
Other |  | 0
Disposal of Q2 Administrators, LLC | 0 |
Foreign currency translation | 0 | 0
Balance at the end of the period | 164,472,000 | 164,472,000
U.S. Services | General Dynamics Information Technology's Citizen Engagement Centers |  |
Changes in goodwill |  |
Goodwill acquired through acquisition |  | 24,884,000
U.S. Services | GT Hiring Solutions |  |
Changes in goodwill |  |
Goodwill acquired through acquisition |  | 0
U.S. Federal Services |  |
Changes in goodwill |  |
Balance at the beginning of the period | 382,618,000 | 228,148,000
Goodwill acquired through acquisition | 0 |
Other |  | 0
Disposal of Q2 Administrators, LLC | (899,000) |
Foreign currency translation | 0 | 0
Balance at the end of the period | 381,719,000 | 382,618,000
U.S. Federal Services | General Dynamics Information Technology's Citizen Engagement Centers |  |
Changes in goodwill |  |
Goodwill acquired through acquisition |  | 154,470,000
U.S. Federal Services | GT Hiring Solutions |  |
Changes in goodwill |  |
Goodwill acquired through acquisition |  | 0
Outside the U.S. |  |
Changes in goodwill |  |
Balance at the beginning of the period | 37,379,000 | 32,146,000
Goodwill acquired through acquisition | 7,652,000 |
Other |  | 372,000
Disposal of Q2 Administrators, LLC | 0 |
Foreign currency translation | 1,907,000 | (1,772,000)
Balance at the end of the period | $ 46,938,000 | 37,379,000
Outside the U.S. | General Dynamics Information Technology's Citizen Engagement Centers |  |
Changes in goodwill |  |
Goodwill acquired through acquisition |  | 5,286,000
Outside the U.S. | GT Hiring Solutions |  |
Changes in goodwill |  |
Goodwill acquired through acquisition |  | $ 1,347,000

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