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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
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Payables and Accruals [Abstract] |  |
Ongoing accrued expenses | $ 256,012 | $ 242,918
Project-related provisions | 155,739 | 227,049
Taxes payable | 27,843 | 34,143
Dividends payable | 35,046 | 31,736
Derivative instruments | 20,821 | 5,685
Other | 211,176 | 126,556
Total accrued expenses and other current liabilities | $ 706,637 | $ 668,087

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