Summary of Vesting Activities for Investment Share Program and Restricted Stock Awards (Detail) |
3 Months Ended |
|---|---|
|
Mar. 26, 2016
$ / shares
shares
| |
| Number of shares | |
| Non-vested at beginning of period | shares | 60,922 |
| Granted | shares | 27,221 |
| Vested | shares | (19,232) |
| Forfeited | shares | (1,633) |
| Non-vested at end of period | shares | 67,278 |
| Weighted Average Fair Value | |
| Non-vested at beginning of period | $ / shares | $ 150.03 |
| Granted | $ / shares | 161.39 |
| Vested | $ / shares | 111.63 |
| Forfeited | $ / shares | 134.65 |
| Non-vested at end of period | $ / shares | $ 165.98 |