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Financing Arrangements - Additional Information (Detail)
$ / shares in Units, shares in Millions
1 Months Ended 12 Months Ended
Feb. 02, 2016
USD ($)
Feb. 29, 2016
USD ($)
Extension
Apr. 29, 2016
USD ($)
$ / shares
shares
Apr. 24, 2015
USD ($)
Apr. 25, 2014
USD ($)
$ / shares
shares
Apr. 26, 2013
$ / shares
shares
Jun. 10, 2008
USD ($)
Debt Instrument [Line Items]              
Short-term loan maturity date     Nov. 02, 2016        
Notes issued, proceeds amount     $ 0 $ 495,000,000 $ 0    
Short-term loan $ 870,000,000   870,000,000 0 0    
Repayment of short-term loan     $ 20,000,000 0 0    
Interest rate on short-term loan     1.57%        
Sale leaseback transaction, net proceeds, financing obligations     $ 148,000,000 0 $ 0    
Properties Not Qualified For Sale Leaseback Accounting              
Debt Instrument [Line Items]              
Sale leaseback transaction, net book value     67,000,000        
Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit facility, amount   $ 300,000,000          
Credit facility, date expiry   Dec. 21, 2017          
Credit facility, increase in facility   $ 50,000,000          
Credit facility, number of extensions | Extension   2          
Credit facility, extensions period   1 year          
Credit facility, outstanding borrowings     $ 0        
Minimum | Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit facility, base rate     0.20%        
Interest coverage ratio     350.00%        
Maximum | Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit facility, base rate     1.20%        
Leverage ratio     300.00%        
Put Option | Common Stock              
Debt Instrument [Line Items]              
Convertible Note Hedge number of shares contracted to sell | shares           32  
Convertible Note Hedge Exercise Price | $ / shares           $ 31.85  
Convertible note hedge and warrants exercised and settled with shares of common stock | shares         (4)    
Warrant | Common Stock              
Debt Instrument [Line Items]              
Convertible note hedge and warrants exercised and settled with shares of common stock | shares         1    
Outstanding warrants, number of shares | shares         40    
Exercise price of warrants | $ / shares         $ 41.28    
Warrants exercised, number of shares | shares         32    
Warrant | Weighted Average | Common Stock              
Debt Instrument [Line Items]              
Exercise price of warrants | $ / shares         $ 43.09    
Convertible Notes Payable              
Debt Instrument [Line Items]              
Notes issued, interest rate             1.75%
Short-term loan maturity date     Jun. 01, 2013        
Notes issued, principal amount             $ 1,265,000,000
Conversion factor for convertible notes     31.40        
Denominator of principal amount upon which conversion rate is based     $ 1,000        
Conversion price of notes to shares of common stock | $ / shares     $ 31.85        
Conversion of convertible notes | shares     5        
Excess conversion value over principal amount of Convertible Notes     $ 179,000,000        
Long-term debt             $ 1,017,000,000
Effective interest rate             6.31%
Notes issued, issuance discount             $ 248,000,000
Issuance costs on Convertible Notes             21,000,000
Equity Components Of Convertible Notes              
Debt Instrument [Line Items]              
Issuance costs on Convertible Notes             $ 5,000,000
Foreign Currency Sub Facility | Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit facility, amount   $ 100,000,000          
Letter Of Credit Sub Facility | Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit facility, amount   50,000,000          
Swingline Sub Facility | Revolving Credit Facility              
Debt Instrument [Line Items]              
Credit facility, amount   $ 10,000,000          
Senior Notes              
Debt Instrument [Line Items]              
Notes issued, principal amount     1,500,000,000 1,500,000,000      
Notes issued, issuance discount     $ 4,000,000 5,000,000      
Senior Notes | Due 2021              
Debt Instrument [Line Items]              
Notes issued, interest rate     3.375%        
Short-term loan maturity date     Jun. 15, 2021        
Notes issued, proceeds amount     $ 495,000,000        
Notes issued, principal amount     $ 500,000,000 $ 500,000,000      
Effective interest rate     3.54% 3.54%      
Senior Notes | Due 2017              
Debt Instrument [Line Items]              
Notes issued, interest rate     2.00%        
Notes issued, principal amount     $ 750,000,000 $ 750,000,000      
Effective interest rate     2.25% 2.25%      
Senior Notes | Due 2022              
Debt Instrument [Line Items]              
Notes issued, interest rate     3.25%        
Notes issued, principal amount     $ 250,000,000 $ 250,000,000      
Effective interest rate     3.43% 3.43%