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Goodwill And Intangiable Assets - Schedule of goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Goodwill [Roll Forward] |  |  |
Balance at the beginning of the period | $ 1,774,406 | $ 593,129 |
Acquisitions | 13,681 | 1,179,943 |
Foreign currency translation | (8,672) | 1,334 |
Balance at the end of the period | 1,779,415 | 1,774,406 | $ 593,129
Goodwill, impairment charges | 0 | 0 | 0
U.S. Federal Services |  |  |
Goodwill [Roll Forward] |  |  |
Balance at the beginning of the period | 1,549,921 | 381,719 |
Acquisitions | 9,942 | 1,168,202 |
Foreign currency translation | 0 | 0 |
Balance at the end of the period | 1,559,863 | 1,549,921 | 381,719
U.S. Services |  |  |
Goodwill [Roll Forward] |  |  |
Balance at the beginning of the period | 164,472 | 164,472 |
Acquisitions | 0 | 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 | 60,013 | 46,938 |
Acquisitions | 3,739 | 11,741 |
Foreign currency translation | (8,672) | 1,334 |
Balance at the end of the period | $ 55,080 | $ 60,013 | $ 46,938

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