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Equity-Based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 30, 2017 | Jan. 07, 2015
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Shares issued, employee stock purchase plan | 79,928 | 53,587 |  |
ESPP, weighted average price per share | $ 65.91 | $ 65.55 |  |
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 | $ 81.71 |  |  |
Class B Common Stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Closing price of common stock | $ 86.60 |  |  |
Stock Appreciation Rights (SARs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Unvested compensation expense | $ 2,832 |  |  |
Total fair value of awards vested | $ 2,871 | $ 3,282 | $ 4,044 |
Unvested compensation expense weighted-average period of recognition, in years | 2 years |  |  |
Award terms | 10 years |  |  |
Performance shares cliff vesting schedule | 3 years |  |  |
Performance-based Restricted Stock Units (PSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Unvested compensation expense | $ 2,798 |  |  |
Granted in Period | 36,415 |  |  |
Weighted Average Grant Date Fair Value, Granted | $ 80.19 |  |  |
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 |  |  |
STIs, Vested | 31,601 |  |  |
Weighted Average Grant Date Fair Value, Vested | $ 71.65 |  |  |
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 in 2016 | 28,700 |  |  |
Restricted Stock Awards (RSAs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Granted in Period | 5,988 |  |  |
Weighted Average Grant Date Fair Value, Granted | $ 80.19 |  |  |
Total fair value of awards vested | $ 480 |  |  |
STIs, Vested | 5,988 |  |  |
Weighted Average Grant Date Fair Value, Vested | $ 80.19 |  |  |
Short Term Incentive Plan [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Granted in Period | 42,795 |  |  |
Weighted Average Grant Date Fair Value, Granted | $ 84.00 |  |  |
Total fair value of awards vested | $ 3,595 |  |  |

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