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Revenue Recognition (Tables)

9 Months Ended

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)