Summary of Vesting Activities for Investment Share Program and Restricted Stock Awards (Detail) |
6 Months Ended |
|---|---|
|
Jun. 25, 2016
$ / shares
shares
| |
| Number of shares | |
| Non-vested at beginning of period | shares | 60,922 |
| Granted | shares | 27,221 |
| Vested | shares | (19,281) |
| Forfeited | shares | (4,105) |
| Non-vested at end of period | shares | 64,757 |
| Weighted Average Fair Value | |
| Non-vested at beginning of period | $ / shares | $ 150.03 |
| Granted | $ / shares | 161.39 |
| Vested | $ / shares | 111.56 |
| Forfeited | $ / shares | 145.12 |
| Non-vested at end of period | $ / shares | $ 166.57 |