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Income taxes (Tables)
6 Months Ended
Aug. 04, 2018
Income Tax Disclosure [Abstract]  
Reconciliation Of Effective Tax Rate
 
26 weeks ended
 
August 4, 2018
 
July 29, 2017
Effective tax rate
32.2
 %
 
23.0
%
Discrete items recognized
(12.2
)%
 
0.5
%
Effective tax rate recognized in income statement
20.0
 %
 
23.5
%