Stockholder's Equity | Stockholder’s Equity (a) Stock Options We have 5.4 million shares of common stock reserved for issuance under our Equity Incentive Plan (Plan) for our employees, officers, and directors. The exercise price for stock options issued under the Plan is to be not less than the fair market value on the date of grant with respect to incentive and nonqualified stock options. Incentive stock options become exercisable in four equal installments from the date of the grant and have a contractual life of seven years. Nonqualified stock options issued pursuant to the Plan have a four -year vesting period and have a contractual life of seven years. Incentive stock options may be granted under this Plan until March 12, 2022. We issue new shares of common stock upon exercise of stock options. Option activity is summarized for the six months ended June 28, 2015 as follows: Number of shares Weighted average exercise price Average remaining contractual life (years) Aggregate intrinsic value Outstanding, December 28, 2014 158,879 $ 78.90 3.7 $ 16,553 Granted 29,270 182.73 Exercised (7,205 ) 68.63 Cancelled (645 ) 112.01 Outstanding, June 28, 2015 180,299 $ 96.04 3.7 $ 12,226 Exercisable, June 28, 2015 107,722 65.20 2.5 10,233 The aggregate intrinsic value in the table above is before applicable income taxes, based on our closing stock price of $160.20 as of the last business day of the six -month period ended June 28, 2015 , which would have been received by the optionees had all options been exercised on that date. As of June 28, 2015 , total unrecognized stock-based compensation expense related to nonvested stock options was approximately $2,740 , which is expected to be recognized over a weighted average period of approximately 2.7 years . During the six -month periods ended June 28, 2015 and June 29, 2014 , the total intrinsic value of stock options exercised was $728 and $2,172 , respectively. During the six -month periods ended June 28, 2015 and June 29, 2014 , the weighted average grant date fair value of options granted was $59.11 and $50.23 , respectively. No shares were vested during the six -month periods ended June 28, 2015 or June 29, 2014 . The Plan had 888,088 shares available for grant as of June 28, 2015 . (b) Restricted Stock Units Restricted stock units are granted annually under the Plan at the discretion of the Compensation Committee of our Board of Directors. We grant restricted stock units subject to three -year cliff vesting and a cumulative three -year earnings target. The number of units which vest at the end of the three-year period is based on performance against the target. These restricted stock units are subject to forfeiture if they have not vested at the end of the three-year period. Stock-based compensation is recognized for the number of units expected to vest at the end of the period and is expensed beginning on the grant date through the end of the performance period. For each grant, restricted stock units meeting the performance criteria will vest as of the end of the third fiscal year in the performance period, subject to a Plan specified maximum number of shares that may be issued to any individual in any year in settlement of restricted stock units. The distribution of vested restricted stock units as common stock typically occurs in March of the following year. The common stock is issued to participants net of the number of shares needed for the required minimum employee withholding taxes. We issue new shares of common stock upon the disbursement of restricted stock units. Restricted stock units are contingently issuable shares, and the activity for the six months ended June 28, 2015 is as follows: Number of shares Weighted average grant date fair value Outstanding, December 28, 2014 265,989 $ 108.82 Granted 95,570 180.97 Vested (20,882 ) 102.09 Cancelled (11,399 ) 119.61 Outstanding, June 28, 2015 329,278 $ 129.82 As of June 28, 2015 , the total stock-based compensation expense related to nonvested awards not yet recognized was $21,406 , which is expected to be recognized over a weighted average period of 2.0 years. The weighted average grant date fair value of restricted stock units granted during the six -month periods ended June 28, 2015 and June 29, 2014 was $180.97 and $147.23 , respectively. During the six -month periods ended June 28, 2015 and June 29, 2014 , we recognized $4,018 and $6,876 , respectively, of stock-based compensation expense related to restricted stock units. (c) Employee Stock Purchase Plan We have reserved 600,000 shares of common stock for issuance under our Employee Stock Purchase Plan (ESPP). The ESPP is available to substantially all employees subject to employment eligibility requirements. Participants may purchase our common stock at 85% of the beginning or ending closing price, whichever is lower, for each six-month period ending in May and November. During the six -month periods ended June 28, 2015 , and June 29, 2014 , we issued 8,747 and 8,037 shares of common stock, respectively, under the ESPP. As of June 28, 2015 , we had 195,521 shares available for future issuance under the ESPP. |