Stock Incentive and Purchase Plans (Stock Option Valuation Assumptions) (Details)	12 Months Ended
	Apr. 26, 2013		Apr. 27, 2012		Apr. 29, 2011
Dividend Yield	0.00%	[1]	0.00%	[1]	0.00%	[1]
Risk-free interest rate - based on grant date, minimum	0.94%	[2]	0.73%	[2]	1.18%	[2]
Risk-free interest rate - based on grant date, maximum	1.57%	[2]	2.23%	[2]	2.50%	[2]
Expected volatility at grant date, minimum	44.95%	[3]	47.04%	[3]	45.14%	[3]
Expected volatility at grant date, maximum	51.14%	[3]	59.07%	[3]	52.54%	[3]
Maximum [Member]
Expected option term - in years per group of employees/consultants	9 years 4 months 21 days	[4]	6 years 7 months 2 days	[4]	6 years 6 months	[4]
Minimum [Member]
Expected option term - in years per group of employees/consultants	6 years 4 months 28 days	[4]	4 years 29 days	[4]	4 years 1 month 13 days	[4]

[1] We have not historically paid dividends and currently do not plan to pay dividends.

[2] We use yield rates on U.S. Treasury securities for a period that approximated the expected term of the award to estimate the risk-free interest rate.

[3] We estimated the expected volatility based on our historic and implied volatility data.

[4] We estimated the expected term of options granted using historic data of actual time elapsed between the date of grant and the exercise or forfeiture of options for employees. For consultants the expected term is the remaining time until expiration of the option.