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Common Stock Options (Tables) | 3 Months Ended
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May 04, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Activity Related to Restricted Shares of Common Stock | The following table summarizes the activity related to the restricted shares of common stock (in thousands):
| Number of shares |  | Deposit liability
Unvested, February 2, 2013 | 31,542 |  |  | $ | 308 |
Vested | (11,137 | ) |  | (80 | )
Unvested, May 4, 2013 | 20,405 |  |  | $ | 228 |
Schedule of Stock Option Activity Under Plan | Stock option activity under the Plan was as follows:
| Options outstanding |  | Weighted average exercise price |  | Weighted average remaining contractual term
Balance at February 2, 2013 | 1,187,817 |  |  | $ | 10.43 |  |  | 9.3
Granted | 122,250 |  |  | 37.22 |  |  |
Forfeited | (4,843 | ) |  | 4.95 |  |  |
Exercised | (36,781 | ) |  | 4.28 |  |  |
Balance at May 4, 2013 | 1,268,443 |  |  | $ | 13.21 |  |  | 8.9
Exercisable at May 4, 2013 | 56,158 |  |  | $ | 10.73 |  |  | 7.2
Schedule of Fair Value of Option Award Granted Weighted Average Assumptions | The fair value of each option award granted to employees, including outside directors, is estimated on the date of grant and the fair value of each option award granted to non-employees is estimated on the date of grant and is required to be periodically revalued over the contractual period until the option award is exercised or forfeited using the Black-Scholes option-pricing model with the following weighted average assumptions:
| Thirteen Weeks Ended
May 4, 2013 |  | April 28, 2012
Expected volatility | 50.0 | % |  | 50.0 | %
Risk-free interest rate | 1.1 | % |  | 1.5 | %
Expected life of options - for employee grants | 6.3 years |  |  | 7.0 years |
Expected dividend yield | — | % |  | — | %

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- Definition Tabular disclosure of the number, aggregate intrinsic value (except for nonpublic entities), and weighted-average remaining contractual term for both restricted stock units outstanding and restricted stock units fully vested and expected to vest at the date of the latest statement of financial position. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (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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