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Basis of presentation (Details)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Aug. 02, 2019
USD ($)
Aug. 03, 2018
USD ($)
Aug. 02, 2019
USD ($)
Aug. 03, 2018
USD ($)
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 $ 3,200 $ 3,400 $ 6,600 $ 5,500        
New accounting guidance                
Lease, Practical Expedients, Package [true false]     true          
Lease, Practical Expedient, Lessor Single Lease Component [true false] true   true          
Lease, Practical Expedient, Use of Hindsight [true false]     false          
Operating lease assets $ 8,405,346   $ 8,405,346          
Operating lease liabilities 8,395,946   8,395,946          
Cumulative Effect of New Accounting Principle in Period of Adoption 28,830 $ (41,316) 28,830 $ (41,316)        
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   $ 900