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Employee Benefits - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Retirement Benefits [Abstract]      
Severance pay liability $ 258,262 $ 267,713  
Deposit with insurance companies 202,230 206,054  
Severance expenses $ 28,472 $ 32,908 $ 34,165