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Revenue Recognition - Disaggregated revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Revenue Recognition
Revenue	$ 5,115,600	$ 4,980,200	$ 5,040,000	$ 5,037,500	$ 5,305,800	$ 5,148,000	$ 4,790,900	$ 4,910,800	$ 20,173,329	$ 20,155,512	$ 18,203,402
Cost reimbursable
Revenue Recognition
Revenue									10,414,200	9,474,800	8,737,600
Guaranteed maximum price
Revenue Recognition
Revenue									3,956,300	4,722,000	4,186,800
Fixed price
Revenue Recognition
Revenue									5,802,800	5,958,700	5,279,000
Americas
Revenue Recognition
Revenue									16,191,100	15,951,400	14,202,500
Europe, Middle East, Africa
Revenue Recognition
Revenue									2,213,100	2,727,000	2,648,200
Asia Pacific
Revenue Recognition
Revenue									$ 1,769,100	$ 1,477,100	$ 1,352,700

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No definition available.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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