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Stockholders' Equity and Stock-Based Compensation - Information Pertaining to Stock Options Granted and Related Assumptions (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 29, 2018
Share-based Payment Arrangement [Abstract]      
Options granted (in shares) 1.0 1.0 1.7
Weighted-average exercise price $ 45.96 $ 41.36 $ 40.76
Weighted average grant date fair value (in usd per share) $ 13.92 $ 13.54 $ 12.98
Assumptions:      
Risk-free interest rates 1.70% 3.00% 2.10%
Expected life (in years) 4 years 9 months 18 days 4 years 9 months 18 days 4 years 8 months 12 days
Expected volatility 33.60% 34.30% 35.30%
Dividend yield $ 0.0 $ 0.0 $ 0.0