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Schedule of Information on Restricted Stock Units (Detail) - Restricted Stock Units (RSUs)
9 Months Ended
Sep. 28, 2019
$ / shares
shares
Number of Shares  
Beginning Balance | shares 292,345
Granted | shares 68,543
Shares earned in excess of target | shares 71,172
Vested shares, including shares earned in excess of target | shares (226,981)
Forfeited | shares (6,481)
Ending Balance | shares 198,598
Weighted Average Grant Date Fair Value  
Beginning Balance | $ / shares $ 66.31
Granted | $ / shares 89.37
Shares earned in excess of target | $ / shares 54.78
Vested shares, including shares earned in excess of target | $ / shares 53.27
Forfeited | $ / shares 86.60
Ending Balance | $ / shares $ 84.37