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Fair Value of Pension Assets by Asset Category and by Level (Detail) (USD $) In Thousands	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	$ 20,173	$ 9,990	$ 5,860
Quoted Prices in Active Markets for Identical Assets (Level 1)
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	11,644
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fixed income securities \| Short duration bond mutual funds
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	468
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fixed income securities \| Intermediate duration bond mutual funds
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	1,761
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Fixed income securities \| Long-term duration bond mutual funds
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	5,414
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Other investments \| Global allocation mutual funds
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	2,929
Quoted Prices in Active Markets for Identical Assets (Level 1) \| Cash and cash equivalents
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	1,072
Significant Other Observable Inputs (Level 2)
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	8,529
Significant Other Observable Inputs (Level 2) \| Other investments \| Swiss Life collective foundation
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	8,046
Significant Other Observable Inputs (Level 2) \| Other investments \| Taiwan collective trust
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	483
Fixed income securities \| Short duration bond mutual funds
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	468
Fixed income securities \| Intermediate duration bond mutual funds
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	1,761
Fixed income securities \| Long-term duration bond mutual funds
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	5,414
Other investments \| Global allocation mutual funds
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	2,929
Other investments \| Swiss Life collective foundation
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	8,046
Other investments \| Taiwan collective trust
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	483
Cash and cash equivalents
Schedule of Pension and Other Postretirment Plan Assets by Fair Value [Line Items]
Fair value of plan assets	$ 1,072

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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