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Revenue Recognition - Disaggregated revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Revenue Recognition
Revenue	$ 5,040,022	$ 4,790,910	$ 10,077,517	$ 9,701,742
Cost reimbursable
Revenue Recognition
Revenue	2,567,900	2,251,700	5,139,500	4,608,900
Guaranteed maximum price
Revenue Recognition
Revenue	1,003,600	1,149,800	2,027,600	2,328,400
Fixed price
Revenue Recognition
Revenue	1,468,500	1,389,400	2,910,400	2,764,400
Americas
Revenue Recognition
Revenue	4,025,700	3,784,800	8,096,100	7,713,500
Europe, Middle East, Africa
Revenue Recognition
Revenue	577,100	632,400	1,127,200	1,221,700
Asia Pacific
Revenue Recognition
Revenue	$ 437,200	$ 373,700	$ 854,200	$ 766,500

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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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 32
-Paragraph 2A
-URI http://asc.fasb.org/extlink&oid=82859839&loc=SL82860478-203043

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130539-203045

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130545-203045

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