Retirement plans - Assumptions used to Determine Benefit Obligations and Periodic Pension Costs (Details) - Pension plan - Foreign Plan	12 Months Ended
	Feb. 01, 2020	Feb. 02, 2019
Assumptions used to determine benefit obligations (at the end of the year):
Discount rate	1.70%	2.70%
Salary increases		1.50%
Assumptions used to determine net periodic pension costs (at the start of the year):
Discount rate	2.70%	2.60%
Expected return on UK Plan assets	3.50%	3.60%
Salary increases	1.50%	2.50%