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Schedule of Information on Restricted Stock Units (Detail) - Restricted Stock Units (RSUs)
6 Months Ended
Jun. 27, 2020
$ / shares
shares
Number of Shares  
Beginning Balance | shares 198,875
Granted | shares 59,478
Shares earned in excess of target | shares 11,648
Vested shares, including shares earned in excess of target | shares (76,290)
Forfeited | shares (10,987)
Ending Balance | shares 182,724
Weighted Average Grant Date Fair Value  
Beginning Balance | $ / shares $ 84.37
Granted | $ / shares 102.66
Shares earned in excess of target | $ / shares 77.00
Vested shares, including shares earned in excess of target | $ / shares 73.44
Forfeited | $ / shares 100.55
Ending Balance | $ / shares $ 93.44