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Income taxes (Tables)
3 Months Ended
May 05, 2018
Income Tax Disclosure [Abstract]  
Reconciliation Of Effective Tax Rate
 
13 weeks ended
 
May 5, 2018
 
April 29, 2017
Effective tax rate
28.3
 %
 
23.0
%
Discrete items recognized
(13.5
)%
 
0.6
%
Effective tax rate recognized in income statement
14.8
 %
 
23.6
%