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Debt - Convertible Senior Notes Due 2021 (Details)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 15, 2015
USD ($)
$ / shares
shares
Sep. 09, 2015
USD ($)
shares
Apr. 29, 2017
shares
Jan. 28, 2017
shares
Oct. 24, 2015
trading_day
Jan. 27, 2018
USD ($)
shares
Jul. 29, 2017
USD ($)
shares
Jul. 30, 2016
USD ($)
shares
Jul. 25, 2015
USD ($)
shares
Jul. 15, 2015
USD ($)
Debt Instrument [Line Items]                    
Amortization of debt discount           $ 9,170,000 $ 17,610,000 $ 14,709,000 $ 0  
Stock Repurchased and Retired During Period, Value $ 60,000,000 $ 60,000,000       $ 16,875,000 $ 62,909,000 $ 169,997,000 $ 87,146,000  
Repurchase of common stock, shares | shares 805,000 805,000 400,000 313,006   200,000 713,006 2,511,578 1,669,924  
Payments for Hedge, Financing Activities           $ 0 $ 0 $ 115,818,000 $ 0  
0.75% Convertible Senior Notes Due 2021                    
Debt Instrument [Line Items]                    
Debt instrument, face amount $ 485,000,000.0         $ 485,000,000 $ 485,000,000 $ 485,000,000    
Debt, interest rate (in percent)           0.75% 0.75% 0.75%    
Debt instrument conversion ratio 0.0103211                  
Debt instrument, convertible, conversion price (per share) | $ / shares $ 96.89                  
Convertible debt, trading day threshold | trading_day         20          
Convertible debt, consecutive trading day threshold         30 days          
Convertible debt, percentage of stock trigger price threshold         130.00%          
Convertible debt, measurement period for percentage of product sale price of common stock and applicable conversion threshold         98.00%          
Convertible debt, comparable yield           5.50%        
Amortization of debt discount           $ 9,200,000 $ 17,600,000 $ 14,700,000    
Convertible Debt           402,249,000 392,233,000 373,077,000    
Unamortized discount           74,899,000 84,069,000 101,679,000    
Debt issuance cost           $ 7,852,000 $ 8,698,000 $ 10,244,000    
Proceeds from Convertible Debt $ 471,700,000                  
Debt Instrument, Unamortized Discount (Premium), Net 13,300,000                  
Payments for Hedge, Financing Activities 41,100,000                  
Proceeds from Debt for General Corporate Purposes 73,900,000                  
7.125% Senior Subordinated Notes                    
Debt Instrument [Line Items]                    
Debt instrument, face amount                   $ 277,500,000.0
Debt, interest rate (in percent)         7.125% 7.125% 7.125% 7.125%
Repayments of Debt $ 296,600,000