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Fair Value of Pension Assets by Asset Category and by Level (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	$ 8,015	$ 20,173	$ 9,990
Other investments \| Swiss Life collective foundation
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	7,513
Other investments \| Taiwan collective trust
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	502
Significant Other Observable Inputs (Level 2)
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	8,015
Significant Other Observable Inputs (Level 2) \| Other investments \| Swiss Life collective foundation
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	7,513
Significant Other Observable Inputs (Level 2) \| Other investments \| Taiwan collective trust
Schedule of Pension Plan Assets by Fair Value [Line Items]
Fair value of plan assets	$ 502

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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