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Current and long-term obligations (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 10, 2019
Jul. 31, 2020
Aug. 02, 2019
Apr. 03, 2020
Jan. 31, 2020
Current and long-term obligations          
Debt issuance costs, net   $ (27,941)     $ (16,012)
Current and long-term obligations   4,089,001     2,911,993
Current and long-term obligations   4,089,001     2,911,993
Repayment of long-term debt   $ 1,037 $ 525    
Senior unsecured credit facility | LIBOR loans          
Current and long-term obligations          
Variable rate basis   LIBOR      
Spread on variable rate (as a percent)   1.015%      
Senior unsecured credit facility | Base-rate loans          
Current and long-term obligations          
Variable rate basis   base rate      
Spread on variable rate (as a percent)   0.015%      
Senior unsecured credit facility, Revolving Facility          
Current and long-term obligations          
Current and long-term obligations   $ 0      
Current and long-term obligations   0      
Maximum financing under credit agreements $ 1,250,000 $ 1,250,000      
Credit facility term 5 years 5 years      
Facility fee rate   0.11%      
Borrowing availability under credit facility   $ 1,250,000      
Borrowing availability except for amount reserved for commercial paper program   1,060,000      
Senior unsecured credit facility, Revolving Facility | Letters of credit          
Current and long-term obligations          
Maximum financing under credit agreements $ 175,000 175,000      
Letters of credit outstanding   4,800      
3.25% Senior Notes due April 15, 2023          
Current and long-term obligations          
Current and long-term obligations   899,289     899,163
Current and long-term obligations   899,289     899,163
Discount on debt issuance   $ 711     $ 837
Stated interest rate (as a percent)   3.25%     3.25%
4.150% Senior Notes due Nov 1, 2025          
Current and long-term obligations          
Current and long-term obligations   $ 499,549     $ 499,511
Current and long-term obligations   499,549     499,511
Discount on debt issuance   $ 451     $ 489
Stated interest rate (as a percent)   4.15%     4.15%
3.875% Senior Notes due April 15. 2027          
Current and long-term obligations          
Current and long-term obligations   $ 599,685     $ 599,664
Current and long-term obligations   599,685     599,664
Discount on debt issuance   $ 315     $ 336
Stated interest rate (as a percent)   3.875%     3.875%
4.125% Senior Notes due May 1, 2028          
Current and long-term obligations          
Current and long-term obligations   $ 499,594     $ 499,572
Current and long-term obligations   499,594     499,572
Discount on debt issuance   $ 406     $ 428
Stated interest rate (as a percent)   4.125%     4.125%
Senior Notes Due 2030 And 2050 [Member]          
Current and long-term obligations          
Debt issue costs       $ 13,600  
3.500% Senior Notes due April 3, 2030          
Current and long-term obligations          
Current and long-term obligations   $ 999,349      
Current and long-term obligations   999,349      
Discount on debt issuance   $ 651   700  
Amount borrowed       $ 1,000,000  
Stated interest rate (as a percent)   3.50%   3.50%  
4.125% Senior Notes due April 3, 2050          
Current and long-term obligations          
Current and long-term obligations   $ 495,013      
Current and long-term obligations   495,013      
Discount on debt issuance   $ 4,987   $ 5,000  
Amount borrowed       $ 500,000  
Stated interest rate (as a percent)   4.125%   4.125%  
Unsecured commercial paper notes          
Current and long-term obligations          
Current and long-term obligations         $ 425,200
Current and long-term obligations         425,200
Maximum maturity   364 days      
Maximum aggregate borrowing amount   $ 1,000,000      
Unsecured commercial paper notes | Wholly-owned subsidiary          
Current and long-term obligations          
Current and long-term obligations   181,000      
Current and long-term obligations   181,000      
Other          
Current and long-term obligations          
Current and long-term obligations   124,463     4,895
Current and long-term obligations   124,463     $ 4,895
Letter Of Credit Outside Of Revolving Facility          
Current and long-term obligations          
Letters of credit outstanding   $ 53,900