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Schedule of Information on Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) - $ / shares
12 Months Ended
Apr. 24, 2018
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Number of Shares        
Beginning Balance   387,372 378,238 444,157
Granted 9,324 65,824 67,913 79,948
Vested   (67,971)   (81,344)
Forfeited   (92,880) (58,779) (64,523)
Ending Balance   292,345 387,372 378,238
Weighted Average Grant Date Fair Value        
Beginning Balance   $ 55.75 $ 50.46 $ 51.10
Granted   95.94 76.81 51.58
Vested   53.92   53.08
Forfeited   52.36 46.00 52.99
Ending Balance   $ 66.31 $ 55.75 $ 50.46