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Share-Based Compensation | 12 Months Ended
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Feb. 03, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Share-Based Compensation | (6) Share-Based Compensation Equity Incentive Plan Pursuant to the Company's 2002 Equity Incentive Plan (the “Plan”), the Company’s board of directors may grant stock options, restricted shares and restricted stock units to officers, directors, key employees and professional service providers. The Plan, as amended, allows for the issuance of up to a total of 7,600,000 shares under the Plan. As of February 3, 2018, 3,367,530 stock options, restricted shares, or restricted stock units were available for grant. Common Stock Options All stock options have a term not greater than ten years. Stock options vest and become exercisable in whole or in part, in accordance with vesting conditions set by the Company’s board of directors. Options granted to date generally vest over four years from the date of grant. Stock option activity under the Plan was as follows:
| Options outstanding |  | Weighted average exercise price |  | Weighted average remaining contractual term
Balance as of January 31, 2015 | 1,160,934 |  |  | $ | 24.80 |  |  | 8.0
Granted | 116,894 |  |  | 28.58 |  |  |
Forfeited | (73,790 | ) |  | 34.93 |  |  |
Exercised | (115,364 | ) |  | 7.90 |  |  |
Balance as of January 30, 2016 | 1,088,674 |  |  | 26.31 |  |  | 7.5
Granted | 51,611 |  |  | 39.30 |  |  |
Forfeited | (47,881 | ) |  | 36.18 |  |  |
Exercised | (225,767 | ) |  | 14.55 |  |  |
Balance as of January 28, 2017 | 866,637 |  |  | 29.60 |  |  | 6.7
Granted | — |  |  | — |  |  |
Forfeited | (19,172 | ) |  | 37.13 |  |  |
Exercised | (327,980 | ) |  | 29.27 |  |  |
Balance as of February 3, 2018 | 519,485 |  |  | 29.53 |  |  | 5.9
Exercisable as of February 3, 2018 | 386,785 |  |  | $ | 27.95 |  |  | 5.4
The Company did not grant any stock options in fiscal 2017. The fair value of each option award granted to employees in fiscal 2016 and fiscal 2015, including outside directors, is estimated on the date of grant using the Black-Scholes option-pricing model with the following weighted average assumptions:
| Fiscal Year
2016 |  | 2015
Expected volatility | 47.6 | % |  | 47.0 | %
Risk-free interest rate | 1.6 | % |  | 1.8 | %
Expected life of options | 6.4 years |  |  | 6.4 years |
Expected dividend yield | — | % |  | — | %
The Company uses the simplified method to estimate the expected term of the option. The expected volatility incorporates historical and implied volatility of similar entities whose share prices are publicly available. The risk-free rate for the expected term of the option is based on the U.S. Treasury yield curve in effect at the time of grant. The per-share weighted average grant-date fair value of stock options granted to employees in fiscal 2016 and fiscal 2015 was $18.89 and $13.67, respectively. The total intrinsic value of stock options exercised during fiscal 2017, fiscal 2016 and fiscal 2015 was $9.7 million, $6.4 million and $3.2 million, respectively. The aggregate intrinsic value of stock options exercisable and stock options outstanding as of February 3, 2018 was $13.5 million and $17.3 million, respectively. In fiscal 2017, fiscal 2016 and fiscal 2015, the Company received cash from the exercise of options of $9.6 million, $3.3 million and $0.9 million, respectively. In fiscal 2016 and fiscal 2015 excess tax benefits from option exercises and vesting of estricted and performance-based restricted stock units were $1.6 million and $0.6 million, respectively. Upon option exercise, the Company issued new shares of common stock. Restricted Stock Units and Performance-Based Restricted Stock Units All restricted stock units ("RSU") and performance-based restricted stock units ("PSU") vest in accordance with vesting conditions set by the compensation committee of the Company’s board of directors. RSU's granted to date have vesting periods ranging from less than one year to five years from the date of grant. PSU's granted to date have vesting periods ranging from one year to five years from the date of grant, including grants that have a cumulative three year performance period, subject to satisfaction of the applicable performance goals established for the respective grant. The Company periodically assesses the probability of achievement of the performance criteria and adjusts the amount of compensation expense accordingly. Compensation is recognized over the vesting period and adjusted for the probability of achievement of the performance criteria. RSU and PSU activity under the Plan was as follows:
| Restricted Stock Units |  | Performance-Based Restricted Stock Units
| Number |  | Weighted-Average Grant Date Fair Value |  | Number |  | Weighted-Average Grant Date Fair Value
Non-vested balance as of January 31, 2015 | 147,770 |  |  | $ | 35.95 |  |  | 392,181 |  |  | $ | 38.20 |
Granted | 115,248 |  |  | 30.62 |  |  | 85,282 |  |  | 28.58 |
Vested | (44,574 | ) |  | 34.40 |  |  | — |  |  | — |
Forfeited | (6,762 | ) |  | 33.01 |  |  | — |  |  | — |
Non-vested balance as of January 30, 2016 | 211,682 |  |  | 33.47 |  |  | 477,463 |  |  | 36.48 |
Granted | 127,787 |  |  | 41.33 |  |  | 127,160 |  |  | 39.22 |
Vested | (46,168 | ) |  | 37.95 |  |  | (77,260 | ) |  | 38.83 |
Forfeited | (18,125 | ) |  | 34.84 |  |  | (22,807 | ) |  | 34.20 |
Non-vested balance as of January 28, 2017 | 275,176 |  |  | 36.27 |  |  | 504,556 |  |  | 36.91 |
Granted | 158,304 |  |  | 40.52 |  |  | 147,552 |  |  | 39.65 |
Vested | (88,550 | ) |  | 34.21 |  |  | (141,003 | ) |  | 38.15 |
Forfeited | (35,376 | ) |  | 41.11 |  |  | (15,446 | ) |  | 35.20 |
Non-vested balance as of February 3, 2018 | 309,554 |  |  | $ | 38.48 |  |  | 495,659 |  |  | $ | 37.43 |
In connection with the vesting of RSU's and PSU's during fiscal 2017, the Company withheld 33,327 shares with an aggregate value of $1.5 million in satisfaction of minimum tax withholding obligations due upon vesting. In connection with the vesting of RSU's during fiscal 2016, the Company withheld 46,750 shares with an aggregate value of $1.9 million in satisfaction of minimum tax withholding obligations due upon vesting. In connection with the vesting of RSU's during fiscal 2015, the Company withheld 9,462 shares with an aggregate value of $0.3 million in satisfaction of minimum tax withholding obligations due upon vesting. As of February 3, 2018, there was $13.5 million of total unrecognized compensation costs related to non-vested share-based compensation arrangements (including stock options, restricted stock units and performance-based restricted stock units) granted under the Plan. The cost is expected to be recognized over a weighted average vesting period of 2.2 years.

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