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Postretirement Benefits - Fair Value of Pension Assets by Asset Category and by Level (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 5,996	$ 8,015	$ 20,173
Other Investments \| Swiss Life collective foundation
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,474
Other Investments \| Taiwan collective trust
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	522
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,996
Level 2 \| Other Investments \| Swiss Life collective foundation
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5,474
Level 2 \| Other Investments \| Taiwan collective trust
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 522

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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