Stockholders' Equity - Schedule of Share-Based Compensation Cost by Caption (Details) (USD $)	12 Months Ended
	May 03, 2015	Apr. 27, 2014	Apr. 28, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 44,600,000	$ 37,966,000	$ 31,961,000
Stock-based compensation capitalized as part of inventory	2,300,000	1,700,000
Cost of revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	9,908,000	8,261,000	6,915,000
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	17,764,000	14,660,000	10,970,000
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	6,251,000	5,083,000	3,743,000
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 10,677,000	$ 9,962,000	$ 10,333,000