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Business combinations and disposal - Schedule of Goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Changes in goodwill |  |
Balance at the beginning of the period | $ 399,882,000 | $ 402,976,000
Foreign currency translation | (1,772,000) | (3,094,000)
Other | 372,000 |
Balance at the end of the period | 584,469,000 | 399,882,000
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. Health and Human Services |  |
Changes in goodwill |  |
Balance at the beginning of the period | 139,588,000 | 139,588,000
Foreign currency translation | 0 | 0
Other | 0 |
Balance at the end of the period | 164,472,000 | 139,588,000
U.S. Health and Human Services | General Dynamics Information Technology's Citizen Engagement Centers |  |
Changes in goodwill |  |
Goodwill acquired through acquisition | 24,884,000 |
U.S. Health and Human 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 | 228,148,000 | 228,148,000
Foreign currency translation | 0 | 0
Other | 0 |
Balance at the end of the period | 382,618,000 | 228,148,000
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 | 32,146,000 | 35,240,000
Foreign currency translation | (1,772,000) | (3,094,000)
Other | 372,000 |
Balance at the end of the period | 37,379,000 | $ 32,146,000
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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