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Revenue Recognition - Disaggregated revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Revenue Recognition
Revenue	$ 3,313,155	$ 3,235,610
Cost reimbursable
Revenue Recognition
Revenue	1,327,400	1,394,400
Guaranteed maximum price
Revenue Recognition
Revenue	1,197,900	947,500
Fixed price
Revenue Recognition
Revenue	787,900	893,700
Americas
Revenue Recognition
Revenue	2,557,500	2,452,500
Europe, Middle East, Africa
Revenue Recognition
Revenue	391,300	429,600
Asia Pacific
Revenue Recognition
Revenue	$ 364,400	$ 353,500

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