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Computation of Earnings Per Common Share - Narratives (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Apr. 25, 2020
Oct. 24, 2020
Oct. 26, 2019
Sep. 15, 2015
Shares used in computing earnings per common share:        
Proceeds from borrowings on senior credit agreement, including term loans   $ 773,000 $ 345,000  
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    
Note Warrant        
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        
Shares used in computing earnings per common share:        
Proceeds from borrowings on senior credit agreement, including term loans $ 25,000 $ 401,700    
Class of Warrant or Right, Number of Securities Called by Warrants or Rights (shares)       5,006