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Revenue Recognition - Disaggregated revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Revenue Recognition
Revenue	$ 3,245,737	$ 3,412,605	$ 6,481,347	$ 6,768,943
Cost reimbursable
Revenue Recognition
Revenue	1,488,800	1,471,300	2,883,200	2,900,300
Guaranteed maximum price
Revenue Recognition
Revenue	929,100	1,003,600	1,876,600	2,033,900
Fixed price
Revenue Recognition
Revenue	827,800	937,700	1,721,500	1,834,700
Americas
Revenue Recognition
Revenue	2,476,200	2,578,000	4,928,700	5,142,300
Europe, Middle East, Africa
Revenue Recognition
Revenue	405,400	463,200	835,000	893,500
Asia Pacific
Revenue Recognition
Revenue	$ 364,100	$ 371,400	$ 717,600	$ 733,100

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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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