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Schedule of Information on Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) - $ / shares
12 Months Ended
Dec. 25, 2021
Dec. 26, 2020
Dec. 28, 2019
Number of Shares      
Beginning Balance 183,213 198,875 292,345
Granted 46,342 59,967 68,820
Shares earned in excess of target 7,132 11,648 71,172
Vested shares, including shares earned in excess of target (24,600) (76,290) (226,981)
Forfeited (2,688) (10,987) (6,481)
Ending Balance 209,399 183,213 198,875
Weighted Average Grant Date Fair Value      
Beginning Balance $ 93.44 $ 84.37 $ 66.31
Granted 128.64 102.58 89.34
Shares earned in excess of target 31.97 77.00 54.78
Vested shares, including shares earned in excess of target 59.85 73.44 53.27
Forfeited 107.76 100.55 86.60
Ending Balance $ 102.90 $ 93.44 $ 84.37