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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Sep. 30, 2020
Accrued expenses and Other Current Liabilities [Abstract]    
Ongoing accrued expenses $ 206,905 $ 217,133
Project-related provisions 125,612 121,658
Taxes payable 34,717 25,739
Dividends payable 44,956 43,084
Derivative instruments 3,281 4,902
Other 196,832 181,092
Total accrued expenses and other current liabilities $ 612,303 $ 593,608