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Revenue Recognition (Tables) | 9 Months Ended
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Jun. 30, 2023
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, 2023 |  | June 30, 2022 |  | June 30, 2023 |  | June 30, 2022
| (dollars in thousands)
Performance-based | $ | 617,800 |  |  | 52.0 | % |  | $ | 520,202 |  |  | 46.2 | % |  | $ | 1,761,764 |  |  | 48.3 | % |  | $ | 1,527,368 |  |  | 44.2 | %
Cost-plus | 281,014 |  |  | 23.6 | % |  | 282,578 |  |  | 25.1 | % |  | 940,509 |  |  | 25.8 | % |  | 945,482 |  |  | 27.4 | %
Fixed price | 171,809 |  |  | 14.5 | % |  | 160,219 |  |  | 14.2 | % |  | 527,556 |  |  | 14.5 | % |  | 470,591 |  |  | 13.6 | %
Time and materials | 118,054 |  |  | 9.9 | % |  | 162,786 |  |  | 14.5 | % |  | 414,946 |  |  | 11.4 | % |  | 510,546 |  |  | 14.8 | %
Total revenue | $ | 1,188,677 |  |  |  |  | $ | 1,125,785 |  |  |  |  | $ | 3,644,775 |  |  |  |  | $ | 3,453,987 |  |  |
Table 4.2: Revenue by Customer Type
| For the Three Months Ended |  | For the Nine Months Ended
| June 30, 2023 |  | June 30, 2022 |  | June 30, 2023 |  | June 30, 2022
| (dollars in thousands)
U.S. federal government agencies | $ | 568,924 |  |  | 47.9 | % |  | $ | 507,047 |  |  | 45.0 | % |  | $ | 1,742,739 |  |  | 47.8 | % |  | $ | 1,624,848 |  |  | 47.0 | %
U.S. state government agencies | 445,855 |  |  | 37.5 | % |  | 401,042 |  |  | 35.7 | % |  | 1,329,766 |  |  | 36.5 | % |  | 1,183,876 |  |  | 34.3 | %
International government agencies | 148,742 |  |  | 12.5 | % |  | 191,753 |  |  | 17.0 | % |  | 491,861 |  |  | 13.5 | % |  | 557,928 |  |  | 16.2 | %
Other, including local municipalities and commercial customers | 25,156 |  |  | 2.1 | % |  | 25,943 |  |  | 2.3 | % |  | 80,409 |  |  | 2.2 | % |  | 87,335 |  |  | 2.5 | %
Total revenue | $ | 1,188,677 |  |  |  |  | $ | 1,125,785 |  |  |  |  | $ | 3,644,775 |  |  |  |  | $ | 3,453,987 |  |  |
Table 4.3: Effect of Changes in Contract Estimates
| For the Three Months Ended |  | For the Nine Months Ended
| June 30, 2023 |  | June 30, 2022 |  | June 30, 2023 |  | June 30, 2022
| (in thousands, except per share data)
Benefit to/(reduction of) revenue recognized due to changes in contract estimates | $ | (2,134) |  |  | $ | (959) |  |  | $ | (8,272) |  |  | $ | (5,174) |
Benefit to/(reduction of) diluted earnings per share recognized due to changes in contract estimates | $ | (0.03) |  |  | $ | (0.01) |  |  | $ | (0.09) |  |  | $ | (0.06) |

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