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Income taxes (Tables)
9 Months Ended
Oct. 31, 2020
Income Tax Disclosure [Abstract]  
Reconciliation Of Effective Tax Rate
39 weeks ended
October 31, 2020November 2, 2019
Estimated annual effective tax rate before discrete items19.5 %13.6 %
Discrete items recognized
8.6 %(9.3)%
Effective tax rate recognized in statement of operations
28.1 %4.3 %