Fair value measurements (Details) - Fair Value, Inputs, Level 2 - USD ($) $ in Thousands	9 Months Ended		12 Months Ended
	Oct. 28, 2023	Oct. 29, 2022	Jan. 28, 2023
Fair value measurements
Fair value of financial liabilities	$ 41,633	$ 34,839	$ 37,501
Defined Benefit Plan, Tax Status [Extensible Enumeration]	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember