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Equity-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Sep. 27, 2025
Sep. 28, 2024
Sep. 30, 2023
Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Closing price of common stock $ 204.64    
Class B Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Closing price of common stock $ 206.00    
Employee Stock Purchase Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Maximum discounted purchase price of common stock as a percent of fair market value 85.00%    
2014 Long Term Incentive Plan | Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Shares authorized for the issuance 2,000,000    
Number of shares authorized for awards available for grant 0    
2014 Long Term Incentive Plan | Class B Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Shares authorized for the issuance 2,000,000    
Number of shares authorized for awards available for grant 0    
2025 Long Term Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Number of shares authorized for awards available for grant 1,458,225    
2025 Long Term Incentive Plan | Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Shares authorized for the issuance 1,500,000    
2025 Long Term Incentive Plan | Class B Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Shares authorized for the issuance 1,500,000    
Performance-based Restricted Stock Units (PSUs)      
Share-based Compensation Arrangement by Share-based Payment Award      
Unvested compensation expense $ 5,201    
Unvested compensation expense weighted-average period of recognition, in years 2 years    
Performance period for PSUs 3 years    
Vesting schedule 3 years    
Common stock issued for awards granted 57,600    
Granted in period 25,728    
Weighted Average Grant Date Fair Value, Granted $ 207.10    
Vested in period 38,596    
Weighted Average Grant Date Fair Value, Vested $ 86.97    
Performance-based Restricted Stock Units (PSUs) | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Performance targets for performance based units 0.00%    
Performance-based Restricted Stock Units (PSUs) | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award      
Performance targets for performance based units 200.00%    
Time vested restricted stock units (TVA)      
Share-based Compensation Arrangement by Share-based Payment Award      
Unvested compensation expense $ 5,559    
TVA tranche vesting period start subsequent to award 1 year    
Unvested compensation expense weighted-average period of recognition, in years 2 years    
Common stock issued for awards granted 16,200    
Granted in period 24,659    
Weighted Average Grant Date Fair Value, Granted $ 207.10    
Vested in period 15,947    
Weighted Average Grant Date Fair Value, Vested $ 214.03    
Restricted Stock Awards (RSAs)      
Share-based Compensation Arrangement by Share-based Payment Award      
Granted in period 5,436    
Weighted Average Grant Date Fair Value, Granted $ 207.10    
Vested in period 5,436    
Weighted Average Grant Date Fair Value, Vested $ 207.10    
Total fair value of awards vested $ 1,126    
Stock Appreciation Rights (SARs)      
Share-based Compensation Arrangement by Share-based Payment Award      
SARs, Granted 0    
Award terms 10 years    
Unvested compensation expense $ 0    
Vesting schedule 3 years    
Total fair value of awards vested $ 741 $ 1,511 $ 2,426