Share-Based Compensation (Compensation Expense Recognized In The Condensed Consolidated Statements Of Operations) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 01, 2017	Jul. 02, 2016	Jul. 01, 2017	Jul. 02, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amounts charged against earnings, before income tax benefit	$ 23,154	$ 21,416	$ 42,009	$ 40,782
Amount of related income tax benefit recognized in earnings	6,647	6,793	12,063	12,748
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	21,859	20,143	39,359	37,954
Associate stock purchase plan expense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amounts charged against earnings, before income tax benefit	1,495	1,463	2,970	3,219
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	$ (200)	$ (190)	$ (320)	$ (391)