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Revenue Recognition (Tables) | 6 Months Ended
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Mar. 31, 2024
Revenue from Contract with Customer [Abstract] |
Schedule of Disaggregation of Revenue |
Table 4.1: Revenue by Contract Type
| For the Three Months Ended |  | For the Six Months Ended
| March 31, 2024 |  | March 31, 2023 |  | March 31, 2024 |  | March 31, 2023
| (dollars in thousands)
Performance-based | $ | 738,888 |  |  | 54.8 | % |  | $ | 574,747 |  |  | 47.6 | % |  | $ | 1,443,599 |  |  | 54.0 | % |  | $ | 1,143,964 |  |  | 46.6 | %
Cost-plus | 334,498 |  |  | 24.8 | % |  | 312,176 |  |  | 25.9 | % |  | 676,513 |  |  | 25.3 | % |  | 659,495 |  |  | 26.9 | %
Fixed price | 166,816 |  |  | 12.4 | % |  | 180,674 |  |  | 15.0 | % |  | 343,493 |  |  | 12.8 | % |  | 355,747 |  |  | 14.5 | %
Time and materials | 108,155 |  |  | 8.0 | % |  | 139,255 |  |  | 11.5 | % |  | 211,793 |  |  | 7.9 | % |  | 296,892 |  |  | 12.1 | %
Total revenue | $ | 1,348,357 |  |  |  |  | $ | 1,206,852 |  |  |  |  | $ | 2,675,398 |  |  |  |  | $ | 2,456,098 |  |  |
Table 4.2: Revenue by Customer Type
| For the Three Months Ended |  | For the Six Months Ended
| March 31, 2024 |  | March 31, 2023 |  | March 31, 2024 |  | March 31, 2023
| (dollars in thousands)
U.S. federal government agencies | $ | 685,939 |  |  | 50.9 | % |  | $ | 569,897 |  |  | 47.2 | % |  | $ | 1,348,885 |  |  | 50.4 | % |  | $ | 1,173,815 |  |  | 47.8 | %
U.S. state government agencies | 483,147 |  |  | 35.8 | % |  | 446,549 |  |  | 37.0 | % |  | 970,090 |  |  | 36.3 | % |  | 883,911 |  |  | 36.0 | %
International government agencies | 156,796 |  |  | 11.6 | % |  | 161,359 |  |  | 13.4 | % |  | 312,408 |  |  | 11.7 | % |  | 343,119 |  |  | 14.0 | %
Other, including local municipalities and commercial customers | 22,475 |  |  | 1.7 | % |  | 29,047 |  |  | 2.4 | % |  | 44,015 |  |  | 1.6 | % |  | 55,253 |  |  | 2.2 | %
Total revenue | $ | 1,348,357 |  |  |  |  | $ | 1,206,852 |  |  |  |  | $ | 2,675,398 |  |  |  |  | $ | 2,456,098 |  |  |
Table 4.3: Effect of Changes in Contract Estimates
| For the Three Months Ended |  | For the Six Months Ended
| March 31, 2024 |  | March 31, 2023 |  | March 31, 2024 |  | March 31, 2023
| (in thousands, except per share data)
Benefit to/(reduction of) revenue recognized due to changes in contract estimates | $ | (3,098) |  |  | $ | (6,496) |  |  | $ | (9,196) |  |  | $ | (6,137) |
Benefit to/(reduction of) diluted earnings per share recognized due to changes in contract estimates | $ | (0.04) |  |  | $ | (0.08) |  |  | $ | (0.11) |  |  | $ | (0.07) |

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