Fair value measurements (Details) - Fair Value, Inputs, Level 2 - USD ($) $ in Thousands	6 Months Ended		12 Months Ended
	Aug. 03, 2024	Jul. 29, 2023	Feb. 03, 2024
Fair value measurements
Fair value of financial liabilities	$ 48,720	$ 42,529	$ 42,653
Defined Benefit Plan, Tax Status [Extensible Enumeration]	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember	us-gaap:NonqualifiedPlanMember