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Shareholders' Equity (Schedule Of Shares Reserved For Future Issuance) (Details) | Sep. 28, 2019 shares
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Share-based Compensation Arrangement by Share-based Payment Award |
Class A shares and Class B shares reserved for issuance | 12,451,721
Conversion Of Class B To Class A Shares |
Share-based Compensation Arrangement by Share-based Payment Award |
Class A shares and Class B shares reserved for issuance | 7,484,778
Employee Stock Purchase Plan |
Share-based Compensation Arrangement by Share-based Payment Award |
Class A shares and Class B shares reserved for issuance | 1,866,485
2014 Long Term Incentive Plan |
Share-based Compensation Arrangement by Share-based Payment Award |
Class A shares and Class B shares reserved for issuance | 1,902,393
2008 Stock Appreciation Rights Plan |
Share-based Compensation Arrangement by Share-based Payment Award |
Class A shares and Class B shares reserved for issuance | 1,198,065

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