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Share-Based Compensation Plans - Weighted Average Assumptions used for Calculating Fair Value of Stock Options Granted (Detail) - $ / shares
12 Months Ended
Oct. 02, 2020
Sep. 27, 2019
Sep. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (years) 3 years    
Stock Options with Market-based Vesting Criteria      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (years)   3 years 10 months 24 days 3 years 4 months 24 days
Target price   $ 53.87 $ 98.99
RSUs      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected term (years) 3 years 3 months 29 days    
Expected dividends 0.00%