Summary of Significant Accounting Policies - Black-Scholes Valuation Model Weighted-Average Assumptions (Detail) |
9 Months Ended | |
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Oct. 31, 2015 |
Nov. 01, 2014 |
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| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] | ||
| Volatility rate | 38.60% | 40.80% |
| Average risk-free interest rate | 1.60% | 1.40% |
| Average expected life (in years) | 5 years | 3 years 9 months 18 days |
| Dividend yield | 0.00% | 0.00% |
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- References No definition available.
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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 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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- 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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