Significant Accounting Policies - Additional Information (Detail)			12 Months Ended
	Apr. 26, 2013 Convertible Notes Payable	Jun. 10, 2008 Convertible Notes Payable	Apr. 26, 2013 Minimum Developed Technology	Apr. 26, 2013 Minimum Customer Contracts/Relationships	Apr. 26, 2013 Minimum Covenants Not To Compete	Apr. 26, 2013 Minimum Trademarks And Trade Names	Apr. 26, 2013 Maximum	Apr. 26, 2013 Maximum Developed Technology	Apr. 26, 2013 Maximum Customer Contracts/Relationships	Apr. 26, 2013 Maximum Covenants Not To Compete	Apr. 26, 2013 Maximum Trademarks And Trade Names
Summary Of Significant Accounting Policies [Line Items]
Finite-Lived Intangible Asset, Useful Life			3 years	2 years	2 years	2 years		6 years	8 years	3 years	7 years
Maturity period of currency exchange derivatives							1 year
Convertible Senior Notes interest rate	1.75%	1.75%
Convertible Senior Notes maturity year	2013