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Revenue Recognition - Disaggregated revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Revenue Recognition
Revenue	$ 3,569,000	$ 3,189,700	$ 3,245,700	$ 3,235,600	$ 3,513,400	$ 3,360,200	$ 3,412,600	$ 3,356,300	$ 13,239,976	$ 13,642,455	$ 13,878,316
Cost reimbursable
Revenue Recognition
Revenue									5,734,500	5,958,200	5,440,300
Guaranteed maximum price
Revenue Recognition
Revenue									3,896,800	3,962,600	4,673,900
Fixed price
Revenue Recognition
Revenue									3,608,700		3,764,100
Americas
Revenue Recognition
Revenue									10,138,300	10,390,800	10,512,300
Europe, Middle East, Africa
Revenue Recognition
Revenue									1,620,300	1,752,100	1,816,200
Asia Pacific
Revenue Recognition
Revenue									$ 1,481,400	$ 1,499,600	$ 1,549,800

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