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Income taxes (Tables)
6 Months Ended
Jul. 31, 2021
Income Tax Disclosure [Abstract]  
Reconciliation Of Effective Tax Rate
26 weeks ended
July 31, 2021August 1, 2020
Estimated annual effective tax rate before discrete items21.4 %22.3 %
Discrete items recognized
(15.5)%8.9 %
Effective tax rate recognized in statements of operations
5.9 %31.2 %