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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
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Payables and Accruals [Abstract] |  |
Project-related provisions | $ 227,049 | $ 208,357
Taxes payable | 34,143 | 38,430
Dividends payable | 31,736 | 28,693
Derivative instruments | 5,685 | 4,407
Other | 369,474 | 331,818
Total accrued expenses and other current liabilities | $ 668,087 | $ 611,705

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