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Income taxes (Tables)
 3 Months Ended
May 04, 2019
Income Tax Disclosure [Abstract]  
Reconciliation Of Effective Tax Rate
 
13 weeks ended
 
May 4, 2019
 
May 5, 2018
Effective tax rate before discrete items
14.7
 %
 
28.3
 %
Discrete items recognized
(1.7
)%
 
(13.5
)%
Effective tax rate recognized in statement of operations
13.0
 %
 
14.8
 %