Financing Arrangements - Additional Information (Detail) (USD $)			12 Months Ended										12 Months Ended			1 Months Ended	12 Months Ended
	Apr. 25, 2014	Apr. 26, 2013	Apr. 25, 2014 Senior Notes	Apr. 26, 2013 Senior Notes	Apr. 25, 2014 Revolving Credit Facility Extension	Apr. 25, 2014 Revolving Credit Facility Minimum	Apr. 25, 2014 Revolving Credit Facility Maximum	Apr. 25, 2014 Revolving Credit Facility Maximum Leverage Ratio	Apr. 25, 2014 Revolving Credit Facility Minimum Interest Coverage Ratio	Apr. 25, 2014 Revolving Credit Facility Foreign Currency Sub Facility	Apr. 25, 2014 Revolving Credit Facility Letter Of Credit Sub Facility	Apr. 25, 2014 Revolving Credit Facility Swingline Subfacility	Apr. 25, 2014 Common Stock	Apr. 25, 2014 Common Stock Warrant	Apr. 26, 2013 Common Stock Warrant	Jun. 30, 2013 Common Stock Put Option	Apr. 25, 2014 Common Stock Put Option	Apr. 26, 2013 Common Stock Put Option	Apr. 25, 2014 Convertible Notes Payable	Jun. 10, 2008 Convertible Notes Payable	Jun. 10, 2008 Convertible Notes Payable Equity Component
Debt Instrument [Line Items]
Interest expense			$ 25,100,000	$ 9,400,000
Note repurchase price, percentage of principal amount of notes			101.00%
Notes issued, principal amount	1,000,000,000	2,264,900,000																		1,265,000,000
Notes issued, interest rate																				1.75%
Convertible Notes, maturity date																			Jun. 01, 2013
Conversion price of notes to shares of common stock																			$ 31.85
Common stock shares issued for excess conversion value													4,900,000						4,900,000
Numerator of common stock ratio for convertible notes																			31.40
Denominator of principal amount upon which conversion rate is based																			1,000
Excess conversion value over principal amount of Convertible Notes																			178,900,000
Convertible Notes																				1,017,000,000
Effective interest rate																				6.31%
Notes issued, issuance discount	4,500,000	12,500,000																		248,000,000
Issuance costs on Convertible Notes																				21,400,000	5,200,000
Convertible Note Hedge number of shares contracted to sell																	0	31,800,000
Convertible Note Hedge Exercise Price																		31.85
Convertible note hedge and warrants exercised and settled with shares of common stock														1,100,000		3,900,000	(3,900,000)
Outstanding warrants, number of shares														0	39,700,000
Exercise price of warrants														43.09	41.28
Warrants exercised, number of shares														31,900,000
Credit facility, amount					250,000,000					100,000,000	50,000,000	10,000,000
Credit facility,date expiry					Dec. 21, 2017
Credit facility, increase in facility					100,000,000
Credit facility, number of extensions					2
Credit facility, extensions period					1 year
Credit facility, base rate						0.20%	1.20%
Covenant Terms								3.0:1.0	3.5:1.0
Credit facility, outstanding borrowings					$ 0