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Revenue Recognition - Disaggregated revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenue Recognition
Revenue	$ 3,235,610	$ 3,356,338
Cost reimbursable
Revenue Recognition
Revenue	1,394,400	1,429,000
Guaranteed maximum price
Revenue Recognition
Revenue	947,500	1,030,300
Fixed price
Revenue Recognition
Revenue	893,700	897,000
Americas
Revenue Recognition
Revenue	2,452,500	2,564,300
Europe, Middle East, Africa
Revenue Recognition
Revenue	429,600	430,300
Asia Pacific
Revenue Recognition
Revenue	$ 353,500	$ 361,700

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+ References

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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