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Pension and Retirement Plans (Detail) - Accrued benefit liability - USD ($)
$ in Thousands
Sep. 30, 2016
Sep. 30, 2015
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]    
Current accrued benefit liability $ 581 $ 675
Non-current accrued benefit liability 13,441 10,009
Total accrued benefit liability $ 14,022 $ 10,684