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Income taxes (Tables)
6 Months Ended
Jul. 29, 2017
Income Tax Disclosure [Abstract]  
Reconciliation Of Effective Tax Rate
 
26 weeks ended
 
July 29, 2017
 
July 30, 2016
Forecasted annual effective tax rate
23.0
%
 
25.8
%
Discrete items recognized
0.5
%
 
%
Effective tax rate recognized in income statement
23.5
%
 
25.8
%