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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
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