XML 1077 R62.htm IDEA: XBRL DOCUMENT v3.20.4
Schedule of Information on Restricted Stock Units (Detail) - Restricted Stock Units (RSUs) - $ / shares
12 Months Ended
Dec. 26, 2020
Dec. 28, 2019
Dec. 29, 2018
Number of Shares      
Beginning Balance 198,875 292,345 387,372
Granted 59,967 68,820 65,824
Shares earned in excess of target 11,648 71,172  
Vested shares, including shares earned in excess of target (76,290) (226,981) (67,971)
Forfeited (10,987) (6,481) (92,880)
Ending Balance 183,213 198,875 292,345
Weighted Average Grant Date Fair Value      
Beginning Balance $ 84.37 $ 66.31 $ 55.75
Granted 102.58 89.34 95.94
Shares earned in excess of target 77.00 54.78  
Vested shares, including shares earned in excess of target 73.44 53.27 53.92
Forfeited 100.55 86.60 52.36
Ending Balance $ 93.44 $ 84.37 $ 66.31