Shareholders' Equity (Schedule Of Shares Reserved For Future Issuance) (Details)	Oct. 03, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award
Class A shares and Class B shares reserved for issuance	12,200,444
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	7,480,484
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award
Class A shares and Class B shares reserved for issuance	1,747,015
2014 Long Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Class A shares and Class B shares reserved for issuance	1,806,390
2008 Stock Appreciation Rights Plan
Share-based Compensation Arrangement by Share-based Payment Award
Class A shares and Class B shares reserved for issuance	1,166,555