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Income taxes (Tables)
9 Months Ended
Nov. 02, 2019
Income Tax Disclosure [Abstract]  
Reconciliation Of Effective Tax Rate
 
39 weeks ended
 
November 2, 2019
 
November 3, 2018
Estimated annual effective tax rate before discrete items(1)
13.6
 %
 
22.7
 %
Discrete items recognized
(9.3
)%
 
(0.2
)%
Effective tax rate recognized in statement of operations
4.3
 %
 
22.5
 %

(1) 
Fiscal 2019 effective tax rate computed based on actual tax rate for the 39 weeks ended November 3, 2018.