Pension and Retirement Plans (Detail) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
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	$ 5,429,000	$ 3,710,000
Pension and Other Postretirement Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Income (Loss) in Next Fiscal Year	(174,000)
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year	700,000
Defined Benefit Plan, Fair Value of Plan Assets	10,094,000	9,473,000
Contributions in Defined Contribution Plans	186,000	185,000
Domestic Supplemental Retirement Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Loans, Gross, Insurance Policy	$ 1,900,000	$ 1,800,000