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Stock-based Compensation - Narrative (Details) - USD ($)
6 Months Ended 12 Months Ended
Mar. 29, 2025
Sep. 28, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized stock-based compensation expense $ 0 $ 0
Restricted stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized stock-based compensation expense $ 115,600,000 115,400,000
Unrecognized stock-based compensation expense, period of recognition 2 years 4 months 24 days  
Performance stock units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Unrecognized stock-based compensation expense $ 3,800,000 $ 200,000
Unrecognized stock-based compensation expense, period of recognition 1 year 6 months 1 year 6 months