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Debt Components of Convertible Notes (Details)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Sep. 15, 2015
USD ($)
$ / shares
shares
Apr. 24, 2015
trading_day
Oct. 24, 2015
USD ($)
shares
Oct. 25, 2014
USD ($)
Jul. 25, 2015
shares
Debt Instrument [Line Items]          
Debt Instrument, Face Amount     $ 485,000    
Debt Instrument, Unamortized Discount     (114,608)    
Net carrying amount of Notes     360,384    
Equity component of 0.75% senior convertible notes due 2021, net     112,554    
Payments of Debt Issuance Costs     14,494 $ 0  
Stock Repurchased and Retired During Period, Value $ 60,000   $ 69,997    
Stock Repurchased and Retired During Period, Shares | shares 805,000   954,224   1,669,924
Payments for Hedge, Financing Activities     $ 115,818 0  
Amortization of debt discount     1,780 $ 0  
0.75% Convertible Notes Liability Component [Member]          
Debt Instrument [Line Items]          
Debt Issuance Cost $ 10,100   10,008    
Payments of Debt Issuance Costs 1,300        
Amortization of debt discount     100    
0.75% Convertible Notes Equity Component [Member]          
Debt Instrument [Line Items]          
Debt Issuance Cost 3,600        
0.75% Convertible Senior Notes Due 2021          
Debt Instrument [Line Items]          
Debt Instrument, Face Amount 485,000        
Debt Issuance Cost 15,100        
Long-term Debt, Fair Value     $ 376,700    
Proceeds from Convertible Debt 471,700        
Debt Instrument, Unamortized Discount (Premium), Net 13,300        
Payments of Debt Issuance Costs 1,800        
Payments for Hedge, Financing Activities 41,100        
Proceeds from Debt for General Corporate Purposes $ 73,900        
Debt, interest rate (in percent)     0.75%   0.75%
Debt Instrument, Convertible, Conversion Ratio 0.0103211        
Debt Instrument, Convertible, Conversion Price | $ / shares $ 96.89        
Debt Instrument, Convertible, Threshold Trading Days | trading_day   20      
Debt Instrument, Convertible, Threshold Consecutive Trading Days   30 days      
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger   130.00%      
Debt Instrument, Convertible, Measurement Period, Threshold Consecutive Business Days   5 days      
Debt Instrument, Convertible, Measurement Period, Threshold Consecutive Trading Days   5 days      
Debt Instrument, Convertible, Measurement Period, Threshold Percentage of Product of Sale Price of Common Stock and Applicable Conversion Rate   98.00%      
Debt Instrument, Comparable Yield     5.50%    
Amortization of debt discount     $ 1,800    
7.125% Senior Subordinated Notes Due 2021          
Debt Instrument [Line Items]          
Repayments of Debt     $ 296,600    
Debt, interest rate (in percent)     7.125%   7.125%