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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 |  |  |

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