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Debt Components of the Convertible Notes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Sep. 15, 2015
Jan. 23, 2016
Jan. 23, 2016
Jan. 24, 2015
Debt Instrument [Line Items]        
Payments of Debt Issuance Costs     $ 15,542 $ 0
Amortization of debt discount     5,928 $ 0
0.75% Convertible Notes Liability Component [Member]        
Debt Instrument [Line Items]        
Debt Issuance Cost $ (10,100)      
Payments of Debt Issuance Costs 1,300      
Amortization of debt discount   $ 400 500  
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 485,000 485,000 485,000  
Debt Instrument, Unamortized Discount   (110,460) (110,460)  
Debt Issuance Cost (15,100) (9,710) (9,710)  
Net carrying amount of Notes   364,830 364,830  
Equity component of 0.75% senior convertible notes due 2021, net   112,554 112,554  
Debt Instrument, Unamortized Discount (Premium), Net 13,300      
Payments of Debt Issuance Costs $ 1,800      
Amortization of debt discount   $ 4,100 $ 5,900