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Revenue Recognition (Tables)

6 Months Ended

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)