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Pension and Retirement Plans (Detail) - Accrued benefit liability (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Pension and Other Postretirement Defined Benefit Plans, Liabilities [Abstract]
Current accrued benefit liability	$ 658	$ 746
Noncurrent accrued benefit liability	10,440	8,660
Total accrued benefit liability	$ 11,098	$ 9,406

This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans.

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- Definition

This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans.

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