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Revenue Recognition (Tables) | 9 Months Ended
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Jun. 30, 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 Nine Months Ended
| June 30, 2024 |  | June 30, 2023 |  | June 30, 2024 |  | June 30, 2023
| (dollars in thousands)
Performance-based | $ | 758,942 |  |  | 57.7 | % |  | $ | 617,800 |  |  | 52.0 | % |  | $ | 2,202,541 |  |  | 55.2 | % |  | $ | 1,761,764 |  |  | 48.3 | %
Cost-plus | 281,823 |  |  | 21.4 | % |  | 281,014 |  |  | 23.6 | % |  | 958,336 |  |  | 24.0 | % |  | 940,509 |  |  | 25.8 | %
Fixed price | 170,787 |  |  | 13.0 | % |  | 171,809 |  |  | 14.5 | % |  | 514,280 |  |  | 12.9 | % |  | 527,556 |  |  | 14.5 | %
Time and materials | 103,377 |  |  | 7.9 | % |  | 118,054 |  |  | 9.9 | % |  | 315,170 |  |  | 7.9 | % |  | 414,946 |  |  | 11.4 | %
Total revenue | $ | 1,314,929 |  |  |  |  | $ | 1,188,677 |  |  |  |  | $ | 3,990,327 |  |  |  |  | $ | 3,644,775 |  |  |
Table 4.2: Revenue by Customer Type |  |  |  |
| For the Three Months Ended |  | For the Nine Months Ended |  |  |  |
| June 30, 2024 |  | June 30, 2023 |  | June 30, 2024 |  | June 30, 2023 |  |  |  |
| (dollars in thousands) |  |  |  |
U.S. federal government agencies | $ | 666,895 |  |  | 50.7 | % |  | $ | 568,924 |  |  | 47.9 | % |  | $ | 2,015,780 |  |  | 50.5 | % |  | $ | 1,742,739 |  |  | 47.8 | % |  |  |  |
U.S. state government agencies | 470,301 |  |  | 35.8 | % |  | 445,855 |  |  | 37.5 | % |  | 1,440,391 |  |  | 36.1 | % |  | 1,329,766 |  |  | 36.5 | % |  |  |  |
International government agencies | 156,587 |  |  | 11.9 | % |  | 148,742 |  |  | 12.5 | % |  | 468,995 |  |  | 11.8 | % |  | 491,861 |  |  | 13.5 | % |  |  |  |
Other, including local municipalities and commercial customers | 21,146 |  |  | 1.6 | % |  | 25,156 |  |  | 2.1 | % |  | 65,161 |  |  | 1.6 | % |  | 80,409 |  |  | 2.2 | % |  |  |  |
Total revenue | $ | 1,314,929 |  |  |  |  | $ | 1,188,677 |  |  |  |  | $ | 3,990,327 |  |  |  |  | $ | 3,644,775 |  |  |  |  |  |  |
Table 4.3: Effect of Changes in Contract Estimates
| For the Three Months Ended |  | For the Nine Months Ended
| June 30, 2024 |  | June 30, 2023 |  | June 30, 2024 |  | June 30, 2023
| (in thousands, except per share data)
Benefit to/(reduction of) revenue recognized due to changes in contract estimates | $ | (3,576) |  |  | $ | (2,134) |  |  | $ | (12,772) |  |  | $ | (8,272) |
Benefit to/(reduction of) diluted earnings per share recognized due to changes in contract estimates | $ | (0.04) |  |  | $ | (0.03) |  |  | $ | (0.16) |  |  | $ | (0.09) |

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