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Employee Stock Purchase Plan (Tables) | 12 Months Ended
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Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Weighted Average Assumptions of Employee Stock Purchase Plan | The following are the weighted-average assumptions used for the fiscal years ended September 30,
|  | 2017 |  |  | 2018 |  |  | 2019 |
Dividend yield |  | 0.0% |  |  | 0.0% |  |  | 0.0% |
Risk-free interest rate |  | 0.7% |  |  | 1.5% |  |  | 2.4% |
Volatility |  | 40.9% |  |  | 49.9% |  |  | 48.3% |
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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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