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Income taxes (Tables)
6 Months Ended
Aug. 01, 2020
Income Tax Disclosure [Abstract]  
Reconciliation Of Effective Tax Rate
26 weeks ended
August 1, 2020August 3, 2019
Estimated annual effective tax rate before discrete items22.3 %13.7 %
Discrete items recognized
8.9 %(19.0)%
Effective tax rate recognized in statement of operations
31.2 %(5.3)%