Share-based payments (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Feb. 03, 2023	Jan. 28, 2022	Jan. 29, 2021
Share-based payments
Number of shares of common stock authorized for grant	11,838,143
Share-based compensation expense
Pre-tax	$ 72,671	$ 78,178	$ 68,609
Net of tax	56,334	$ 57,774	$ 50,702
Total unrecognized compensation cost	$ 119,600
Expected weighted average expense recognition period (in years)	2 years 1 month 6 days
Employees
Share-based payments
Vesting period	4 years
Board members
Share-based payments
Vesting period	1 year
Stock options
Weighted average for key assumptions used in determining the fair value
Expected dividend yield (as a percent)	1.00%	0.90%	0.90%
Expected stock price volatility (as a percent)	25.40%	26.50%	26.40%
Weighted average risk-free interest rate (as a percent)	2.40%	0.80%	0.70%
Expected term of options	4 years 9 months 18 days	4 years 10 months 24 days	5 years 2 months 12 days
Options Issued
Balance at the beginning of the period (in shares)	2,347,510
Granted (in shares)	813,165
Exercise of share-based awards (in shares)	(514,264)
Canceled (in shares)	(124,115)
Balance, at the end of the period (in shares)	2,522,296	2,347,510
Exercisable at the end of the period (in shares)	973,457
Average Exercise Price
Balance at the beginning of the period (in dollars per share)	$ 133.62
Granted (in dollars per share)	219.82
Exercised (in dollars per share)	115.84
Canceled (in dollars per share)	183.61
Balance at the end of the period (in dollars per share)	162.58	$ 133.62
Exercisable at the end of the period (in dollars per share)	$ 110.74
Remaining Contractual Term
Balance, at the end of the period	7 years 1 month 6 days
Exercisable at the end of the period	5 years 2 months 12 days
Intrinsic Value
Balance at the end of the period	$ 168,452
Exercisable at the end of the period	$ 114,248
Weighted average grant date fair value (in dollars per share)	$ 52.06	$ 42.89	$ 34.60
Intrinsic value of options exercised	$ 62,700	$ 132,300	$ 116,100
Share-based compensation expense
Pre-tax	20,502	21,452	19,933
Net of tax	$ 15,893	$ 15,853	$ 14,730
Performance Stock Units
Share-based payments
Vesting period	3 years
Weighted average grant date fair value of awards issued (in dollars per share)	$ 214.25	$ 193.55	$ 154.53
Intrinsic Value
Balance at the end of the period	$ 71,825
Units Issued
Awards outstanding at the beginning of the period (in shares or rights)	337,243
Granted (in shares or rights)	169,657
Converted to common stock (in shares or rights)	(184,603)
Canceled (in shares or rights)	(7,400)
Awards outstanding at the end of the period (in shares or rights)	314,897	337,243
Share-based compensation expense
Pre-tax	$ 26,920	$ 33,234	$ 27,388
Net of tax	$ 20,868	$ 24,560	$ 20,240
Performance Stock Units | Minimum
Share-based payments
Performance period	1 year
Performance Stock Units | Less than
Share-based payments
Performance period	3 years
Restricted Stock Units
Share-based payments
Weighted average grant date fair value of awards issued (in dollars per share)	$ 223.51	$ 193.76	$ 155.73
Intrinsic Value
Balance at the end of the period	$ 76,923
Units Issued
Awards outstanding at the beginning of the period (in shares or rights)	307,118
Granted (in shares or rights)	222,420
Converted to common stock (in shares or rights)	(146,834)
Canceled (in shares or rights)	(45,455)
Awards outstanding at the end of the period (in shares or rights)	337,249	307,118
Share-based compensation expense
Pre-tax	$ 25,249	$ 23,492	$ 21,288
Net of tax	$ 19,573	$ 17,361	$ 15,732
Restricted Stock Units | Employees
Share-based payments
Vesting period	3 years