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Computation of Earnings Per Common Share - Narratives (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Apr. 25, 2020
Jan. 25, 2020
Apr. 27, 2019
Sep. 15, 2015
Shares used in computing earnings per common share:        
Proceeds from Long-term Lines of Credit $ 675,000   $ 0  
Convertible senior notes        
Shares used in computing earnings per common share:        
Anti-dilutive weighted shares excluded from the calculation, per share conversion price, threshold (in dollars per share) $ 96.89      
Warrants        
Shares used in computing earnings per common share:        
Anti-dilutive weighted shares excluded from the calculation, per share conversion price, threshold (in dollars per share) $ 130.43      
0.75% Convertible Senior Notes Due 2021        
Shares used in computing earnings per common share:        
Debt, interest rate (in percent) 0.75%      
Warrant [Member]        
Shares used in computing earnings per common share:        
Proceeds from Long-term Lines of Credit $ 167,000 $ 25,000    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (shares) 5,006     3,024