Equity-Based Compensation (Schedule Of Total Equity-Based Compensation Expense) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 30, 2011	Dec. 31, 2010	Jan. 01, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense before income taxes	$ 24.6	$ 27.0	$ 20.7
Income tax benefit	(2.8)	(8.6)	(0.5)
Total equity-based compensation expense after income taxes	21.8	18.4	20.2
Cost Of Revenue - Products [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense before income taxes	1.6	2.0	1.7
Cost Of Revenue - Services [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense before income taxes	2.1	2.3	2.2
Research And Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense before income taxes	7.9	8.4	6.0
Sales And Marketing [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense before income taxes	4.3	5.2	4.2
General And Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Equity-based compensation expense before income taxes	$ 8.7	$ 9.1	$ 6.6