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Retirement plans - Fair Value of Unfunded, Non-qualified Deferred Compensation Plans Assets (Details) - USD ($) $ in Millions | Jan. 29, 2022 | Jan. 30, 2021
--- | --- | ---
Defined Contribution Plan Disclosure [Line Items] |  |
Defined contribution plan, plan assets, amount | $ 22.7 | $ 21.7
Mutual funds |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Defined contribution plan, plan assets, amount | 12.4 | 5.0
Level 1 |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Defined contribution plan, plan assets, amount | 12.4 | 5.0
Level 1 | Mutual funds |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Defined contribution plan, plan assets, amount | 12.4 | 5.0
NAV | Money market mutual funds |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Defined contribution plan, plan assets, amount | $ 10.3 | $ 16.7

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