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Revenue Recognition - Disaggregated revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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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- Definition 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 + Details
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