Share-Based Compensation (Compensation Expense Recognized In The Condensed Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 28, 2019	Sep. 30, 2020	Sep. 28, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amounts charged against earnings, before income tax benefit	$ 38,137	$ 31,782	$ 111,724	$ 78,103
Amount of related income tax benefit recognized in earnings	7,818	6,330	22,452	14,888
Stock option and non-vested share compensation expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amounts charged against earnings, before income tax benefit	37,920	30,537	110,500	73,421
Associate stock purchase plan expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amounts charged against earnings, before income tax benefit	1,367	1,321	4,195	4,612
Amounts capitalized in software development costs, net of amortization
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amounts charged against earnings, before income tax benefit	$ (1,150)	$ (76)	$ (2,971)	$ 70