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Equity-Based Compensation (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Oct. 03, 2020
Sep. 28, 2019
Sep. 29, 2018
Jan. 07, 2015
Share-based Compensation Arrangement by Share-based Payment Award        
Shares issued, employee stock purchase plan 119,470 79,928    
ESPP, weighted average price per share $ 58.71 $ 65.91    
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        
Share-based Compensation Arrangement by Share-based Payment Award        
Shares authorized for the issuance       2,000,000
Class A Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Closing price of common stock $ 66.82      
Class B Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Closing price of common stock $ 64.27      
Stock Appreciation Rights (SARs)        
Share-based Compensation Arrangement by Share-based Payment Award        
Award terms 10 years      
Unvested compensation expense $ 2,926      
Unvested compensation expense weighted-average period of recognition, in years 2 years      
Performance shares cliff vesting schedule 3 years      
Total fair value of awards vested $ 2,825 $ 2,871 $ 3,282  
Performance-based Restricted Stock Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award        
Unvested compensation expense $ 2,264      
Unvested compensation expense weighted-average period of recognition, in years 2 years      
Performance period for PSUs 3 years      
Performance shares cliff vesting schedule 3 years      
Granted in period 34,129      
Weighted Average Grant Date Fair Value, Granted $ 85.95      
Vested in period 29,195      
Weighted Average Grant Date Fair Value, Vested $ 82.31      
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%      
Performance-based Restricted Stock Units (PSUs) | Class A and Class B Common Stock        
Share-based Compensation Arrangement by Share-based Payment Award        
Common stock issued for awards granted 14,900      
Restricted Stock Awards (RSAs)        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted in period 7,912      
Weighted Average Grant Date Fair Value, Granted $ 85.95      
Vested in period 7,912      
Weighted Average Grant Date Fair Value, Vested $ 85.95      
Total fair value of awards vested $ 680      
Short Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award        
Granted in period 57,783      
Weighted Average Grant Date Fair Value, Granted $ 86.80      
Vested in period 57,783      
Weighted Average Grant Date Fair Value, Vested $ 86.80      
Total fair value of awards vested $ 5,016