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Employee Stock Purchase Plan - Additional Information (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2013 | Sep. 30, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |
Common stock | 1,000,000 | 500,000
Common stock available under Employee Stock Purchase Plan | 52,837 |
Stock Purchase Plan, requisite continuous service | 1 year |
Annual offerings description | Implementation of up to 10 annual offerings beginning on the first day of October starting in 2008, with each offering terminating on September 30 of the following year |
Closing price of common stock on the first and last day of the offering | 85.00% |
Percentage not exceeding to periodic payment of purchase price | 10.00% |
Maximum common stock value purchased by participant annually | $ 25,000 |
Common stock shares issued under stock purchase plan | 596,030 |

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- Definition Share based compensation arrangement by share based payment award, award implementation description. + References No definition available. + Details
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- Definition Share based compensation arrangement by share based payment award maximum number of common stock value per employee. + References No definition available. + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of additional shares authorized for issuance under an established share-based compensation plan. + References No definition available. + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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