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Revenue Recognition (Tables)

6 Months Ended

Mar. 31, 2025

Revenue from Contract with Customer [Abstract]

Schedule of Revenues Disaggregated by Revenue Sources

The following tables present the Company’s revenues disaggregated by revenue sources:

			Three Months Ended												Six Months Ended
			March 31, 2025						March 31, 2024						March 31, 2025						March 31, 2024
			(in millions)
Cost reimbursable			$	1,463.6					$	1,605.1					$	2,969.3					$	3,222.3
Guaranteed maximum price			1,343.6						1,420.7						2,871.0						2,835.6
Fixed-price			964.4						918.1						1,945.5						1,785.9
Total revenue			$	3,771.6					$	3,943.9					$	7,785.8					$	7,843.8

			Three Months Ended												Six Months Ended
			March 31, 2025						March 31, 2024						March 31, 2025						March 31, 2024
			(in millions)
Americas			$	2,896.9					$	3,039.1					$	6,009.0					$	6,077.9
Europe, Middle East, India, Africa			531.3						619.8						1,068.3						1,115.2
Asia-Australia-Pacific			343.4						285.0						708.5						650.7
Total revenue			$	3,771.6					$	3,943.9					$	7,785.8					$	7,843.8

Schedule of Net Accounts Receivable

Net accounts receivable consisted of the following:

			March 31, 2025						September 30, 2024
			(in millions)
Billed			$	1,938.4					$	2,184.9
Contract retentions			665.6						696.3
Total accounts receivable—gross			2,604.0						2,881.2
Allowance for doubtful accounts and credit losses			(86.1)						(87.9)
Total accounts receivable—net			$	2,517.9					$	2,793.3

X

- 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
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-5

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- References

No definition available.

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X

- Definition

Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(4))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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