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Goodwill And Intangiable Assets - Schedule of goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Goodwill [Roll Forward] |  |  |
Balance at the beginning of the period | $ 1,779,415 | $ 1,774,406 |
Acquisitions |  | 13,681 |
Divestitures | (3,172) |  |
Foreign currency translation | 2,972 | (8,672) |
Balance at the end of the period | 1,779,215 | 1,779,415 | $ 1,774,406
Goodwill, impairment charges | 0 | 0 | 0
U.S. Federal Services |  |  |
Goodwill [Roll Forward] |  |  |
Balance at the beginning of the period | 1,559,863 | 1,549,921 |
Acquisitions |  | 9,942 |
Divestitures | 0 |  |
Foreign currency translation | 0 | 0 |
Balance at the end of the period | 1,559,863 | 1,559,863 | 1,549,921
U.S. Services |  |  |
Goodwill [Roll Forward] |  |  |
Balance at the beginning of the period | 164,472 | 164,472 |
Acquisitions |  | 0 |
Divestitures | 0 |  |
Foreign currency translation | 0 | 0 |
Balance at the end of the period | 164,472 | 164,472 | 164,472
Outside the U.S. |  |  |
Goodwill [Roll Forward] |  |  |
Balance at the beginning of the period | 55,080 | 60,013 |
Acquisitions |  | 3,739 |
Divestitures | (3,172) |  |
Foreign currency translation | 2,972 | (8,672) |
Balance at the end of the period | $ 54,880 | $ 55,080 | $ 60,013

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