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Debt Long-term Notes (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Oct. 15, 2015
USD ($)
Sep. 15, 2015
USD ($)
shares
$ / shares
Apr. 24, 2015
Oct. 24, 2015
USD ($)
shares
Oct. 25, 2014
USD ($)
Jul. 25, 2015
USD ($)
shares
Debt Instrument [Line Items]            
Debt and capital lease obligations       $ 641,634   $ 525,591
Less: current portion       (5,625)   (3,750)
Long-term debt premium on 7.125% senior subordinated notes (amortizes to interest expense through January 2021)       0   $ 2,800
Debt Instrument, Face Amount       485,000    
Amortization of debt discount       1,780 $ 0  
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  
Proceeds from sale of warrants       74,690 0  
Loss on debt extinguishment       (16,260) 0  
Write-off of deferred financing fees and premium on long-term debt       2,017 $ 0  
Long-term debt       636,009   $ 521,841
0.75% Convertible Notes Liability Component [Member]            
Debt Instrument [Line Items]            
Amortization of debt discount       100    
Payments of Debt Issuance Costs   $ 1,300        
Unamortized Debt Issuance Expense   (10,100)   $ (10,008)    
0.75% Convertible Notes Equity Component [Member]            
Debt Instrument [Line Items]            
Unamortized Debt Issuance Expense   (3,600)        
Credit Agreement            
Debt Instrument [Line Items]            
Debt covenant compliance, consolidated leverage maximum (ratio)       3.50    
Debt Instrument, Covenant Compliance, Consolidated Interest Coverage Ratio, Maximum       3.00    
0.75% Convertible Senior Notes Due 2021            
Debt Instrument [Line Items]            
Debt and capital lease obligations       $ 360,384   $ 0
Debt, interest rate (in percent)       0.75%   0.75%
Long-term debt, fair value       $ 376,700    
Debt Instrument, Face Amount   $ 485,000        
Debt Instrument, Convertible, Conversion Ratio   0.0103211        
Debt Instrument, Convertible, Conversion Price | $ / shares   $ 96.89        
Amortization of debt discount       1,800    
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        
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | shares   5,006,000        
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ / shares   $ 130.43        
Proceeds from sale of warrants   $ 74,700        
Unamortized Debt Issuance Expense   $ (15,100)        
7.125% Senior Subordinated Notes Due 2021            
Debt Instrument [Line Items]            
Debt and capital lease obligations       $ 0   $ 277,500
Debt, interest rate (in percent)       7.125%   7.125%
Long-term debt premium on 7.125% senior subordinated notes (amortizes to interest expense through January 2021)       $ 0   $ 2,841
Repayments of Debt       296,600    
Debt Instrument, Increase, Accrued Interest $ 4,900          
Debt Instrument, Redemption Price, Percentage 103.563%          
Redemption Premium $ 14,200          
Loss on debt extinguishment       16,300    
Gains (Losses) on Extinguishment of Debt, before Write off of Deferred Debt Issuance Cost       6,500    
Write-off of deferred financing fees and premium on long-term debt       $ 4,900    
Convertible Note Hedge [Member]            
Debt Instrument [Line Items]            
Derivative, Number of Instruments Held | shares   5,006,000        
Debt Instrument, Convertible, Conversion Price | $ / shares   $ 96.89        
Payments for Hedge, Financing Activities   $ 115,800        
Deferred Tax Liabilities, Derivatives   43,400        
Deferred Tax Assets, Derivative Instruments   $ 43,200        
Federal Funds Effective Swap Rate [Member] | Credit Agreement            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate     0.50%      
Eurodollar [Member] | Credit Agreement            
Debt Instrument [Line Items]            
Debt Instrument, Basis Spread on Variable Rate     1.00% 1.75%