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Income taxes (Tables)
 3 Months Ended
May 02, 2020
Income Tax Disclosure [Abstract]  
Reconciliation Of Effective Tax Rate
 
13 weeks ended
 
May 2, 2020
 
May 4, 2019
Estimated annual effective tax rate before discrete items
24.5
%
 
14.7
 %
Discrete items recognized
11.2
%
 
(1.7
)%
Effective tax rate recognized in statement of operations
35.7
%
 
13.0
 %