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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
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