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Revenue Recognition - Schedule of Revenues Disaggregated by Revenue Sources (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Disaggregation of Revenue [Line Items]
Total revenue	$ 4,178,440	$ 4,151,251	$ 11,964,205	$ 11,995,004
Americas
Disaggregation of Revenue [Line Items]
Total revenue	3,277,200	3,247,000	9,286,200	9,325,000
Europe, Middle East, India, Africa
Disaggregation of Revenue [Line Items]
Total revenue	536,400	530,100	1,604,700	1,645,300
Asia-Australia-Pacific
Disaggregation of Revenue [Line Items]
Total revenue	364,800	374,100	1,073,300	1,024,700
Cost reimbursable
Disaggregation of Revenue [Line Items]
Total revenue	1,619,100	1,594,700	4,588,400	4,817,000
Guaranteed maximum price
Disaggregation of Revenue [Line Items]
Total revenue	1,575,800	1,597,500	4,446,800	4,433,100
Fixed-price
Disaggregation of Revenue [Line Items]
Total revenue	$ 983,500	959,000	$ 2,929,000	$ 2,744,900
Maximum
Disaggregation of Revenue [Line Items]
Total revenue		$ 4,151,200

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