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Summary Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
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12 Months Ended | |
|---|---|---|
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Sep. 30, 2012
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Sep. 30, 2011
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Net change | $ 20,000 | $ 27,000 |
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Fair Value, Inputs, Level 2
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | ||
| Balance at September 30, 2011 | 57,000 | |
| Balance at September 30, 2012 | 7,000 | |
| Net change | $ 50,000 | |

