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Basis of presentation (Details)
$ in Thousands
3 Months Ended 12 Months Ended
May 03, 2019
USD ($)
May 04, 2018
USD ($)
Jan. 31, 2020
period
Feb. 01, 2019
period
Feb. 02, 2019
USD ($)
Feb. 03, 2018
USD ($)
Fiscal year, number of weeks | period     52 52    
Merchandise inventories            
LIFO provision (benefit) $ 3,400 $ 2,100        
New accounting guidance            
Lease, Practical Expedients, Package [true false] true          
Lease, Practical Expedient, Use of Hindsight [true false] false          
Operating lease assets $ 8,140,326          
Operating lease liabilities 8,133,414          
Cumulative Effect of New Accounting Principle in Period of Adoption 28,830 (41,316)        
Reclassification from accumulated other comprehensive loss (385,257) $ (365,095)        
Accounting Standards Update 2016-02            
New accounting guidance            
Operating lease assets         $ 8,000,000  
Operating lease liabilities         8,000,000  
Cumulative Effect of New Accounting Principle in Period of Adoption         $ 28,800  
Accounting Standards Update 2016-16            
New accounting guidance            
Increase in deferred income tax liabilities           $ 41,300
Increase (Decrease) in retained earnings           $ (41,300)
Accounting Standards Update 2018-02            
New accounting guidance            
Cumulative Effect of New Accounting Principle in Period of Adoption $ 900