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Net Income per Share - Additional Information (Detail)
3 Months Ended 6 Months Ended
Mar. 01, 2020
Mar. 01, 2019
Jan. 01, 2019
Jun. 27, 2020
employee
shares
Jun. 29, 2019
shares
Jun. 27, 2020
employee
shares
Jun. 29, 2019
shares
Investment Share Program              
Earnings Per Share Note [Line Items]              
Vesting period           5 years  
Investment Share Program | Maximum              
Earnings Per Share Note [Line Items]              
Requirement tenure of employee for investment share program, purchase shares at discount           2 years  
Discount from current market value           40.00%  
Investment Share Program | Minimum              
Earnings Per Share Note [Line Items]              
Requirement tenure of employee for investment share program, purchase shares at discount           1 year  
Discount from current market value           20.00%  
Restricted Stock Awards              
Earnings Per Share Note [Line Items]              
Vesting period 4 years 4 years 5 years        
Common Class A              
Earnings Per Share Note [Line Items]              
Antidilutive securities excluded from computation of earnings per share       23,000 10,000 16,000 6,000
Common Class A | Performance-Based Awards              
Earnings Per Share Note [Line Items]              
Number of shares not included because the performance criteria was not expected to be met             18,000
Common Class A | Performance-Based Awards | Key employee              
Earnings Per Share Note [Line Items]              
Number Of Employees | employee       1   1