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Components of Accrued Expenses and Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Sep. 30, 2018
Payables And Accruals [Abstract]    
Accrued wages and benefits $ 26,747 $ 25,712
Accrued insurance 81,443 77,890
Other accrued expenses and other current liabilities 12,649 12,834
Total accrued expenses and other current liabilities $ 120,839 $ 116,436