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Revenue Recognition (Tables)

6 Months Ended

Mar. 31, 2022

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

Table 4.1: Revenue by Contract Type
			For the Three Months Ended																								For the Six Months Ended
			March 31, 2022												March 31, 2021												March 31, 2022												March 31, 2021
			Amount						%						Amount						%						Amount						%						Amount						%
			(dollars in thousands)
Performance-based			$	516,210					43.9 %						$	349,749					36.4 %						$	1,007,166					43.3 %						$	643,709					33.8 %
Cost-plus			322,823						27.4 %						286,082						29.8 %						662,904						28.5 %						670,565						35.2 %
Fixed price			158,867						13.5 %						146,344						15.3 %						310,372						13.3 %						267,121						14.0 %
Time and materials			179,426						15.2 %						177,105						18.5 %						347,760						14.9 %						323,439						17.0 %
Total revenue			$	1,177,326											$	959,280											$	2,328,202											$	1,904,834

Table 4.2: Revenue by Customer Type
			For the Three Months Ended																								For the Six Months Ended
			March 31, 2022												March 31, 2021												March 31, 2022												March 31, 2021
			Amount						%						Amount						%						Amount						%						Amount						%
			(dollars in thousands)
U.S. state government agencies			$	411,287					35.0 %						$	445,697					46.5 %						$	782,834					33.7 %						$	833,811					43.8 %
U.S. federal government agencies			553,707						47.0 %						307,870						32.1 %						1,117,801						48.0 %						693,442						36.4 %
International government agencies			194,800						16.5 %						171,700						17.9 %						366,175						15.7 %						319,042						16.7 %
Other, including local municipalities and commercial customers			17,532						1.5 %						34,013						3.5 %						61,392						2.6 %						58,539						3.1 %
Total revenue			$	1,177,326											$	959,280											$	2,328,202											$	1,904,834

Table 4.3: Revenue by Geography
			For the Three Months Ended																								For the Six Months Ended
			March 31, 2022												March 31, 2021												March 31, 2022												March 31, 2021
			Amount						%						Amount						%						Amount						%						Amount						%
			(dollars in thousands)
United States			$	971,365					82.5 %						$	778,350					81.1 %						$	1,939,653					83.3 %						$	1,568,529					82.3 %
United Kingdom			107,898						9.1 %						72,882						7.6 %						193,705						8.3 %						137,668						7.2 %
Australia			46,670						4.0 %						70,947						7.4 %						99,484						4.3 %						126,878						6.7 %
Rest of world			51,393						4.4 %						37,101						3.9 %						95,360						4.1 %						71,759						3.8 %
Total revenue			$	1,177,326											$	959,280											$	2,328,202											$	1,904,834

Schedule of Effect of Changes in Contract Estimates

Table 4.4: Effect of Changes in Contract Estimates
			For the Three Months Ended												For the Six Months Ended
			March 31, 2022						March 31, 2021						March 31, 2022						March 31, 2021
			(in thousands, except per share data)
Benefit to/(reduction of) revenue recognized due to changes in contract estimates			$	(1,369)					$	7,603					$	(4,215)					$	15,986
Benefit to/(reduction of) diluted earnings per share recognized due to changes in contract estimates			$	(0.02)					$	0.09					$	(0.05)					$	0.19

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 http://asc.fasb.org/extlink&oid=123351226&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 http://asc.fasb.org/extlink&oid=123351226&loc=SL49130545-203045

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- References

No definition available.

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