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Pension and Retirement Plans (Detail) - Accrued benefit liability - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Liability, Defined Benefit Plan [Abstract]    
Current accrued benefit liability $ 340 $ 325
Non-current accrued benefit liability 6,168 6,653
Total accrued benefit liability $ 6,508 $ 6,978