Pension and Retirement Plans (Detail) - Accrued benefit liability (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Current accrued benefit liability	$ 746	$ 717
Noncurrent accrued benefit liability	8,660	9,431
Total accrued benefit liability	$ 9,406	$ 10,148