Stock Options and Restricted Stock Awards (Fair Values of Options, Black-Scholes Option-Pricing Model, Weighted-Average Assumptions) (Detail) (USD $)
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12 Months Ended | ||
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Sep. 30, 2013
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Sep. 30, 2012
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Sep. 30, 2011
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Dividend yield | 0.00% | 0.00% | 0.00% |
Expected life in years | 5 years 8 months 12 days | 6 years 6 months | 7 years |
Risk-free interest rate | 0.60% | 0.94% | 1.51% |
Expected volatility | 43.80% | 47.00% | 48.00% |
Weighted average fair value of options granted | $ 12.59 | $ 8.78 | $ 7.82 |
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- Definition
The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The risk-free interest rate assumption that is used in valuing an option on its own shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average expected volatility rate of share-based compensation awards. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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