Stock-Based Compensation Expense - Stock-Based Compensation Expense (Detail) (USD $)	3 Months Ended
	Apr. 05, 2015	Mar. 30, 2014	Dec. 31, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 6,946,000	$ 4,004,000
Tax benefit from compensation expense	2,337,000	1,306,000
Recognized Period Costs Capitalized Amount	0		0
Product cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	420,000	285,000
Service cost of revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	73,000	63,000
Research, development, and engineering
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	1,848,000	1,056,000
Selling, general, and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 4,605,000	$ 2,600,000