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Share-Based Compensation | 9 Months Ended
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Nov. 02, 2019
Share-based Payment Arrangement [Abstract] |
Share-Based Compensation | (7) 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 7.6 million shares under the Plan. As of November 2, 2019, approximately 3.3 million 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 during the thirty-nine weeks ended November 2, 2019 was as follows:
| Options Outstanding |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years)
Balance as of February 2, 2019 | 374,257 |  |  | $ | 30.23 |  |  | 5.1
Forfeited | (950 | ) |  | 39.42 |  |  |
Exercised | (105,974 | ) |  | 30.04 |  |  |
Balance as of November 2, 2019 | 267,333 |  |  | 30.27 |  |  | 4.2
Exercisable as of November 2, 2019 | 255,776 |  |  | $ | 30.04 |  |  | 4.1
The fair value of each option award granted to employees, including outside directors, is estimated on the date of grant using the Black-Scholes option-pricing model. There were no stock options granted during the thirty-nine weeks ended November 2, 2019. 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. RSUs granted to date have vesting periods ranging from less than one year to five years from the date of grant. PSUs 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 during the thirty-nine weeks ended November 2, 2019 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 February 2, 2019 | 292,888 |  |  | $ | 53.52 |  |  | 416,200 |  |  | $ | 47.38 |
Granted | 87,361 |  |  | 119.11 |  |  | 85,939 |  |  | 116.92 |
Vested | (106,921 | ) |  | 43.58 |  |  | (117,137 | ) |  | 39.21 |
Forfeited | (17,105 | ) |  | 66.53 |  |  | (27,836 | ) |  | 45.23 |
Non-vested balance as of November 2, 2019 | 256,223 |  |  | $ | 79.16 |  |  | 357,166 |  |  | $ | 66.96 |
In connection with the vesting of RSUs and PSUs during the thirty-nine weeks ended November 2, 2019, the Company withheld 82,505 shares with an aggregate value of $10.3 million in satisfaction of minimum tax withholding obligations due upon vesting. In connection with the vesting of RSUs and PSUs during the thirty-nine weeks ended November 3, 2018, the Company withheld 111,649 shares with an aggregate value of $7.8 million in satisfaction of minimum tax withholding obligations due upon vesting. As of November 2, 2019, there was $22.7 million of total unrecognized compensation costs related to non-vested share-based compensation arrangements (including stock options, RSUs and PSUs) granted under the Plan. The cost is expected to be recognized over a weighted average vesting period of 2.4 years.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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