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Employee Benefits - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract]      
Severance pay liability $ 267,713 $ 240,414  
Deposit with insurance companies 206,054 185,836  
Severance expenses $ 32,908 $ 34,165 $ 31,086