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Revenue Recognition (Tables)

6 Months Ended

Mar. 31, 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 Six Months Ended
			March 31, 2023												March 31, 2022												March 31, 2023												March 31, 2022
			(dollars in thousands)
Performance-based			$	574,747					47.6		%				$	516,210					43.9		%				$	1,143,964					46.6		%				$	1,007,166					43.3		%
Cost-plus			312,176						25.9		%				322,823						27.4		%				659,495						26.9		%				662,904						28.5		%
Fixed price			180,674						15.0		%				158,867						13.5		%				355,747						14.5		%				310,372						13.3		%
Time and materials			139,255						11.5		%				179,426						15.2		%				296,892						12.1		%				347,760						14.9		%
Total revenue			$	1,206,852											$	1,177,326											$	2,456,098											$	2,328,202


Table 4.2: Revenue by Customer Type
			For the Three Months Ended																								For the Six Months Ended
			March 31, 2023												March 31, 2022												March 31, 2023												March 31, 2022
			(dollars in thousands)
U.S. federal government agencies			$	569,897					47.2		%				$	553,707					47.0		%				$	1,173,815					47.8		%				$	1,117,801					48.0		%
U.S. state government agencies			446,549						37.0		%				411,287						34.9		%				883,911						36.0		%				782,834						33.7		%
International government agencies			161,359						13.4		%				194,800						16.5		%				343,119						14.0		%				366,175						15.7		%
Other, including local municipalities and commercial customers			29,047						2.4		%				17,532						1.5		%				55,253						2.2		%				61,392						2.6		%
Total revenue			$	1,206,852											$	1,177,326											$	2,456,098											$	2,328,202