Schedule of Equity Based Compensation Expense (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 28, 2013	Jun. 29, 2012	Jun. 28, 2013	Jun. 29, 2012
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense before income taxes	$ 2.0	$ 4.8	$ 5.1	$ 10.4
Income tax benefit		(0.1)	(0.1)	(0.2)
Total equity-based compensation expense after income taxes	2.0	4.7	5.0	10.2
Cost of Revenue - products
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense before income taxes	0.2	0.2	0.4	0.6
Cost of Revenue - services
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense before income taxes	0.2	0.4	0.6	0.9
Research and Development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense before income taxes	0.3	1.4	0.9	3.2
Sales And Marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense before income taxes	0.3	0.8	0.8	1.7
General and Administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Equity-based compensation expense before income taxes	$ 1.0	$ 2.0	$ 2.4	$ 4.0