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Employee Stock Purchase Plan (Tables) | 12 Months Ended
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Sep. 30, 2013
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Weighted Average Assumptions of Employee Stock Purchase Plan | The following are the weighted-average assumptions used for the fiscal years ended September 30,
|  | 2011 |  | 2012 |  | 2013
Dividend yield |  | 0.0% |  | 0.0% |  | 0.0%
Risk-free interest rate |  | 0.2% |  | 0.1% |  | 0.1%
Volatility |  | 48.9% |  | 51.8% |  | 54.8%
Expected life |  | Six months |  | Six months |  | Six months

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + 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 (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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