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Stockholders' Equity And Stock-Based Compensation (Forfeiture Rates) (Details)
12 Months Ended
Sep. 26, 2025
Sep. 27, 2024
Sep. 29, 2023
Stockholders' Equity And Stock-Based Compensation [Abstract]      
Estimated forfeiture rate, percent 8.62% 8.53% 8.62%