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Schedule of Information on Restricted Stock Units (Detail) - Restricted Stock Units (RSUs)
9 Months Ended
Sep. 25, 2021
$ / shares
shares
Number of Shares  
Beginning Balance | shares 183,213
Granted | shares 46,103
Shares earned in excess of target | shares 7,132
Vested shares | shares (24,600)
Forfeited | shares (2,688)
Ending Balance | shares 209,160
Weighted Average Grant Date Fair Value  
Beginning Balance | $ / shares $ 93.44
Granted | $ / shares 128.78
Shares earned in excess of target | $ / shares 31.97
Vested shares | $ / shares 59.85
Forfeited | $ / shares 107.76
Ending Balance | $ / shares $ 102.90