Shareholders' Equity (Schedule Of Shares Reserved For Future Issuance) (Details)	Oct. 02, 2021 shares
Share-based Compensation Arrangement by Share-based Payment Award
Class A shares and Class B shares reserved for issuance	11,935,699
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	7,476,477
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award
Class A shares and Class B shares reserved for issuance	1,605,368
2014 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Class A shares and Class B shares reserved for issuance	1,725,039
2008 Stock Appreciation Rights Plan
Share-based Compensation Arrangement by Share-based Payment Award
Class A shares and Class B shares reserved for issuance	1,128,815