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Revenue Recognition (Tables)
 9 Months Ended
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 EndedFor the Nine Months Ended
June 30, 2024June 30, 2023June 30, 2024June 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-plus281,823 21.4 %281,014 23.6 %958,336 24.0 %940,509 25.8 %
Fixed price170,787 13.0 %171,809 14.5 %514,280 12.9 %527,556 14.5 %
Time and materials103,377 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 EndedFor the Nine Months Ended
June 30, 2024June 30, 2023June 30, 2024June 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 agencies470,301 35.8 %445,855 37.5 %1,440,391 36.1 %1,329,766 36.5 %
International government agencies156,587 11.9 %148,742 12.5 %468,995 11.8 %491,861 13.5 %
Other, including local municipalities and commercial customers21,146 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 $3,644,775 
Table 4.3: Effect of Changes in Contract Estimates
For the Three Months EndedFor the Nine Months Ended
June 30, 2024June 30, 2023June 30, 2024June 30, 2023
(in thousands, except per share data)
Benefit to/(reduction of) revenue recognized due to changes in contract estimates$(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)