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Debt - Schedule of short-term and long-term debt (Details) - USD ($)
Aug. 01, 2020
Apr. 30, 2020
Feb. 01, 2020
Aug. 03, 2019
Jul. 31, 2019
Debt Instrument [Line Items]          
Short-term debt $ 802,507,000   $ 0 $ 0  
Long-term debt $ 2,286,295,000   312,891,000 312,665,000  
3.375% Senior Notes due 2024          
Debt Instrument [Line Items]          
Stated interest rate (percent) 3.375%        
4.600% Senior Notes due 2025          
Debt Instrument [Line Items]          
Stated interest rate (percent) 4.60% 4.60%      
4.700% Senior Notes due 2027          
Debt Instrument [Line Items]          
Stated interest rate (percent) 4.70% 4.70%      
4.800% Senior Notes due 2030          
Debt Instrument [Line Items]          
Stated interest rate (percent) 4.80% 4.80%      
5.450% Senior Notes due 2050          
Debt Instrument [Line Items]          
Stated interest rate (percent) 5.45% 5.45%      
$800 million revolving credit facility          
Debt Instrument [Line Items]          
Short-term debt $ 800,000,000   0 0  
Other short-term debt financing          
Debt Instrument [Line Items]          
Short-term debt 2,507,000   0 0  
6.530% Series B Senior Notes due 2021          
Debt Instrument [Line Items]          
Long-term debt $ 64,868,000   64,963,000 64,953,000  
6.530% Series B Senior Notes due 2021 | 6.530% Series B Senior Notes due 2021          
Debt Instrument [Line Items]          
Stated interest rate (percent) 6.53%        
$800 million revolving credit facility          
Debt Instrument [Line Items]          
Maximum borrowing capacity (up to) $ 800,000,000       $ 300,000,000
3.375% Senior Notes due 2024          
Debt Instrument [Line Items]          
Long-term debt 248,146,000   247,928,000 247,712,000  
4.600% Senior Notes due 2025          
Debt Instrument [Line Items]          
Long-term debt 693,991,000   0 0  
4.700% Senior Notes due 2027          
Debt Instrument [Line Items]          
Long-term debt 395,124,000   0 0  
4.800% Senior Notes due 2030          
Debt Instrument [Line Items]          
Long-term debt 394,759,000   0 0  
5.450% Senior Notes due 2050          
Debt Instrument [Line Items]          
Long-term debt $ 489,407,000   $ 0 $ 0