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Debt - Convertible Senior Notes Due 2021 (Details)
3 Months Ended 6 Months Ended
Sep. 15, 2015
USD ($)
$ / shares
Jul. 31, 2021
USD ($)
Jan. 30, 2021
USD ($)
Jul. 25, 2020
USD ($)
Jul. 29, 2017
trading_day
Jul. 31, 2021
USD ($)
Jul. 25, 2020
USD ($)
Jan. 25, 2020
USD ($)
Debt Instrument [Line Items]                
Amortization of debt discount           $ 1,329,000 $ 6,089,000  
Repayments of Long-term Lines of Credit           271,875,000 494,250,000  
(Loss) gain on debt extinguishment   $ 0   $ (458,000)   $ (62,000) 12,046,000  
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 10.3211              
Debt instrument, face amount $ 485,000,000 $ 58,264,000 $ 58,264,000     $ 58,264,000   $ 460,000,000
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   $ 700,000   $ 1,700,000   1,300,000 $ 6,100,000  
Convertible Debt   57,889,000 56,410,000     57,889,000    
Unamortized discount   337,000 1,665,000     337,000    
Debt issuance cost   38,000 189,000     38,000    
Repayments of Long-term Lines of Credit   $ 371,400,000 24,300,000          
(Loss) gain on debt extinguishment     $ 100,000     $ (12,000,000)