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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 26, 2025
Sep. 27, 2024
Sep. 29, 2023
Sep. 30, 2022
Tax Credit Carryforward [Line Items]        
Foreign earnings repatriated $ 160,000      
Undistributed earnings of foreign subsidiaries 420,000      
Net operating loss carryovers for federal tax purposes 900      
Net operating loss carryovers for California tax purposes 1,300      
R&D tax credit carryforwards 28,800      
Valuation allowance, deferred tax assets, california 36,200      
Valuation Allowance recorded against federal foreign tax credit deferred tax assets 3,700      
Valuation allowance, deferred tax assets, foreign $ 11,100      
Effective tax rate 15.50% 15.40% 19.40%  
Provision for income taxes $ 46,993 $ 48,163 $ 48,409  
Unrecognized tax benefits, gross 83,666 81,615 $ 76,304 $ 69,682
Unrecognized tax benefits if recognized, would affect our effective tax rate 28,100      
Increase in interest expense for current tax provision 12,200 $ 3,300    
Foreign Tax Credit Carryforward        
Tax Credit Carryforward [Line Items]        
Tax credit carryforward 20,700      
California Research Tax Credit Carryforward        
Tax Credit Carryforward [Line Items]        
Tax credit carryforward 48,600      
Research Tax Credit Carryforward        
Tax Credit Carryforward [Line Items]        
Tax credit carryforward $ 7,700