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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
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