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Income taxes (Tables)
9 Months Ended
Nov. 03, 2018
Income Tax Disclosure [Abstract]  
Reconciliation Of Effective Tax Rate
 
39 weeks ended
 
November 3, 2018
 
October 28, 2017
Effective tax rate
22.7
 %
 
21.2
%
Discrete items recognized
(0.2
)%
 
0.2
%
Effective tax rate recognized in income statement
22.5
 %
 
21.4
%