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Schedule of Information on Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) - $ / shares
12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Number of Shares      
Beginning Balance 292,345 387,372 378,238
Granted 68,820 65,824 67,913
Shares earned in excess of target 71,172    
Vested shares, including shares earned in excess of target (226,981) (67,971)  
Forfeited (6,481) (92,880) (58,779)
Ending Balance 198,875 292,345 387,372
Weighted Average Grant Date Fair Value      
Beginning Balance $ 66.31 $ 55.75 $ 50.46
Granted 89.34 95.94 76.81
Shares earned in excess of target 54.78    
Vested shares, including shares earned in excess of target 53.27 53.92  
Forfeited 86.60 52.36 46.00
Ending Balance $ 84.37 $ 66.31 $ 55.75