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Debt - Convertible Senior Notes Due 2021 (Details)
3 Months Ended 6 Months Ended
Sep. 15, 2015
USD ($)
$ / shares
Jul. 25, 2020
USD ($)
Jan. 25, 2020
USD ($)
Jul. 27, 2019
USD ($)
Jul. 30, 2016
trading_day
Jul. 25, 2020
USD ($)
Jul. 27, 2019
USD ($)
Debt Instrument [Line Items]              
Amortization of debt discount           $ 6,089,000 $ 9,947,000
Repayments of Long-term Lines of Credit           494,250,000 81,000,000
Gain (loss) on debt extinguishment   $ (458,000)   $ 0   $ 12,046,000 0
0.75% Convertible Senior Notes Due 2021              
Debt Instrument [Line Items]              
Debt, interest rate (in percent)   0.75%       0.75%  
Debt intrument, conversion installments amount $ 1,000            
Debt instrument,conversion ratio 10.3211000            
Debt instrument, face amount $ 485,000,000.0 $ 58,264,000 $ 460,000,000     $ 58,264,000  
Debt instrument, convertible, conversion price (per share) | $ / shares $ 96.89            
Convertible debt, trading day threshold | trading_day         20    
Convertible debt, consecutive trading day threshold | trading_day         30    
Convertible debt, percentage of stock trigger price threshold         130.00%    
Debt instrument conversion trigger price | $ / shares $ 125.96            
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   $ 1,700,000   $ 5,000,000.0   6,100,000 $ 9,900,000
Convertible Debt   54,908,000 422,526,000     54,908,000  
Unamortized discount   3,018,000 33,744,000     3,018,000  
Debt issuance cost   338,000 3,730,000     338,000  
Repayments of Long-term Lines of Credit   371,400,000 24,300,000        
Gain (loss) on debt extinguishment   (500,000) $ 100,000     12,000,000.0  
Standby Letters of Credit              
Debt Instrument [Line Items]              
Line of credit   $ 0       $ 0