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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
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Payables and Accruals [Abstract] |  |
Ongoing accrued expenses | $ 259,661 | $ 256,012
Project-related provisions | 140,701 | 155,739
Taxes payable | 28,335 | 27,843
Dividends payable | 38,413 | 35,046
Derivative instruments | 5,053 | 20,821
Other | 175,494 | 211,176
Total accrued expenses and other current liabilities | $ 647,657 | $ 706,637

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