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Revenue Recognition (Tables)

9 Months Ended

Jun. 30, 2022

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

Table 4.1: Revenue by Contract Type
			For the Three Months Ended																								For the Nine Months Ended
			June 30, 2022												June 30, 2021												June 30, 2022												June 30, 2021
			Amount						%						Amount						%						Amount						%						Amount						%
			(dollars in thousands)
Performance-based			$	520,202					46.2 %						$	389,800					31.3 %						$	1,527,368					44.2 %						$	1,033,509					32.8 %
Cost-plus			282,578						25.1 %						282,808						22.7 %						945,482						27.4 %						953,373						30.3 %
Fixed price			160,219						14.2 %						146,175						11.8 %						470,591						13.6 %						413,296						13.1 %
Time and materials			162,786						14.5 %						424,737						34.2 %						510,546						14.8 %						748,176						23.8 %
Total revenue			$	1,125,785											$	1,243,520											$	3,453,987											$	3,148,354

Table 4.2: Revenue by Customer Type
			For the Three Months Ended																								For the Nine Months Ended
			June 30, 2022												June 30, 2021												June 30, 2022												June 30, 2021
			Amount						%						Amount						%						Amount						%						Amount						%
			(dollars in thousands)
U.S. state government agencies			$	401,042					35.7 %						$	431,987					34.7 %						$	1,183,876					34.3 %						$	1,265,798					40.2 %
U.S. federal government agencies			507,047						45.0 %						594,771						47.8 %						1,624,848						47.0 %						1,288,213						40.9 %
International government agencies			191,753						17.0 %						180,049						14.5 %						557,928						16.2 %						499,091						15.9 %
Other, including local municipalities and commercial customers			25,943						2.3 %						36,713						3.0 %						87,335						2.5 %						95,252						3.0 %
Total revenue			$	1,125,785											$	1,243,520											$	3,453,987											$	3,148,354

Table 4.3: Revenue by Geography
			For the Three Months Ended																								For the Nine Months Ended
			June 30, 2022												June 30, 2021												June 30, 2022												June 30, 2021
			Amount						%						Amount						%						Amount						%						Amount						%
			(dollars in thousands)
United States			$	924,839					82.2 %						$	1,053,940					84.8 %						$	2,864,492					83.0 %						$	2,622,469					83.3 %
United Kingdom			109,776						9.7 %						74,109						6.0 %						303,481						8.8 %						211,777						6.7 %
Australia			43,594						3.9 %						65,283						5.2 %						143,078						4.1 %						192,161						6.1 %
Rest of world			47,576						4.2 %						50,188						4.0 %						142,936						4.1 %						121,947						3.9 %
Total revenue			$	1,125,785											$	1,243,520											$	3,453,987											$	3,148,354

Schedule of Effect of Changes in Contract Estimates

Table 4.4: Effect of Changes in Contract Estimates
			For the Three Months Ended												For the Nine Months Ended
			June 30, 2022						June 30, 2021						June 30, 2022						June 30, 2021
			(in thousands, except per share data)
Benefit to/(reduction of) revenue recognized due to changes in contract estimates			$	(959)					$	1,800					$	(5,174)					$	17,800
Benefit to/(reduction of) diluted earnings per share recognized due to changes in contract estimates			$	(0.01)					$	0.03					$	(0.06)					$	0.20

X

- Definition

Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 10
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130551-203045

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- Definition

Tabular disclosure of disaggregation of revenue into categories depicting how nature, amount, timing, and uncertainty of revenue and cash flows are affected by economic factor.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI https://asc.fasb.org/extlink&oid=126920106&loc=SL49130545-203045

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- References

No definition available.

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