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Pension and Retirement Plans (Detail) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Number of Years Defined Benefit Plans are Closed to Newly Hired Employees 2 years  
Number of Years Supplementary Retirement Plans are Closed to Newly Hired Employees 2 years  
Accumulated other comprehensive income $ 5,298 $ 5,769
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year (116)  
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year 300  
Defined Benefit Plan, Fair Value of Plan Assets 8,270 8,239
Contributions in Defined Contribution Plans 204 152
Domestic    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Accumulated other comprehensive income 47 56
Domestic | Pension Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Loans, Gross, Insurance Policy $ 2,100 $ 2,100