Summary of activity of stock plans |
Following is a summary of the activity of the stock plans during 2015, 2016 and 2017: | | | | | | | | | | | | | | | Number of Shares | | Weighted Average Exercise Price | | Weighted Average Remaining Contractual Term | | Aggregate Intrinsic Value | Outstanding at December 27, 2014 | 768,595 |
| | $ | 113.72 |
| | | | | Granted | 291,708 |
| | 104.89 |
| | | | | Exercised | (169,493 | ) | | 74.37 |
| | | | | Forfeited | (41,201 | ) | | 137.02 |
| | | | | Outstanding at December 26, 2015 | 849,609 |
| | $ | 117.42 |
| | 5.18 | | $ | 4,536 |
| Options vested or expected to vest at December 26, 2015 | 818,300 |
| | $ | 117.61 |
| | 5.13 | | 4,456 |
| Options exercisable at December 26, 2015 | 409,068 |
| | $ | 119.43 |
| | 3.74 | | 3,376 |
|
The weighted average per share fair value of options granted during 2015 was $27.91. | | | | | | | | | | | | | | | Number of Shares | | Weighted Average Exercise Price | | Weighted Average Remaining Contractual Term | | Aggregate Intrinsic Value | Outstanding at December 26, 2015 | 849,609 |
| | $ | 117.42 |
| | | | | Granted | 85,092 |
| | 151.37 |
| | | | | Exercised | (109,893 | ) | | 101.69 |
| | | | | Forfeited | (31,635 | ) | | 129.36 |
| | | | | Outstanding at December 31, 2016 | 793,173 |
| | $ | 122.77 |
| | 4.78 | | $ | 16,640 |
| Options vested or expected to vest at December 31, 2016 | 774,139 |
| | $ | 124.18 |
| | 4.75 | | 16,200 |
| Options exercisable at December 31, 2016 | 469,844 |
| | $ | 123.75 |
| | 3.96 | | 9,056 |
|
The weighted average per share fair value of options granted during 2016 was $40.00. | | | | | | | | | | | | | | | Number of Shares | | Weighted Average Exercise Price | | Weighted Average Remaining Contractual Term | | Aggregate Intrinsic Value | Outstanding at December 31, 2016 | 793,173 |
| | $ | 122.77 |
| | | | | Granted | 67,965 |
| | 164.35 |
| | | | | Exercised | (284,574 | ) | | 121.92 |
| | | | | Forfeited | (5,942 | ) | | 104.26 |
| | | | | Outstanding at December 30, 2017 | 570,622 |
| | $ | 128.34 |
| | 4.66 | | $ | 21,806 |
| Options vested or expected to vest at December 30, 2017 | 558,114 |
| | $ | 128.00 |
| | 4.63 | | 21,517 |
| Options exercisable at December 30, 2017 | 351,794 |
| | $ | 123.90 |
| | 3.94 | | 15,005 |
|
The weighted average per share fair value of options granted during 2017 was $43.68.
|
Summary of status of stock options outstanding |
Following is a summary of the status of stock options outstanding at December 30, 2017: | | | | | | | | | | | | | | | | | | Outstanding and Exercisable By Price Range | Options Outstanding | | Options Exercisable | Exercise Price Range | | Number | | Weighted Average Remaining Contractual Life | | Weighted Average Exercise Price | | Number | | Weighted Average Exercise Price | $83.94 - 114.11 | | 239,480 |
| | 4.71 years | | $ | 103.23 |
| | 147,216 |
| | $ | 102.42 |
| $120.91 - 136.42 | | 127,901 |
| | 3.22 years | | 133.88 |
| | 125,459 |
| | 134.07 |
| $142.67 - 164.35 | | 203,241 |
| | 5.53 years | | 154.42 |
| | 79,119 |
| | 147.73 |
| | | 570,622 |
| | | | | | 351,794 |
| | |
|