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Summary of significant accounting policies (Details)	3 Months Ended								12 Months Ended
Summary of significant accounting policies (Details)	Jan. 30, 2021	Oct. 31, 2020	Aug. 01, 2020	May 02, 2020	Feb. 01, 2020	Nov. 02, 2019	Aug. 03, 2019	May 04, 2019	Jan. 30, 2021	Feb. 01, 2020	Feb. 02, 2019
Fiscal period	91 days	91 days	91 days	91 days	91 days	91 days	91 days	91 days	364 days	364 days	364 days
Minimum
Fiscal period									364 days
Maximum
Fiscal period									371 days