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Revenue Recognition - Disaggregated revenues (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Revenue Recognition |  |  |  |
Revenue | $ 4,980,204 | $ 5,147,920 | $ 15,057,721 | $ 14,849,662
Cost reimbursable |  |  |  |
Revenue Recognition |  |  |  |
Revenue | 2,692,700 | 2,409,200 | 7,832,200 | 7,018,200
Guaranteed maximum price |  |  |  |
Revenue Recognition |  |  |  |
Revenue | 950,500 | 1,189,200 | 2,978,100 | 3,517,600
Fixed price |  |  |  |
Revenue Recognition |  |  |  |
Revenue | 1,337,000 | 1,549,500 | 4,247,400 | 4,313,900
Americas |  |  |  |
Revenue Recognition |  |  |  |
Revenue | 4,007,200 | 4,046,300 | 12,103,400 | 11,759,800
Europe, Middle East, Africa |  |  |  |
Revenue Recognition |  |  |  |
Revenue | 538,000 | 741,300 | 1,665,200 | 1,963,000
Asia Pacific |  |  |  |
Revenue Recognition |  |  |  |
Revenue | $ 435,000 | $ 360,300 | $ 1,289,100 | $ 1,126,900

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