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Retirement plans - Fair Value of Unfunded, Non-qualified Deferred Compensation Plans Assets (Details) - USD ($) $ in Millions | Jan. 28, 2023 | Jan. 29, 2022
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Defined Contribution Plan Disclosure [Line Items] |  |
Deferred compensation plan assets | $ 22.3 | $ 22.7
Mutual funds |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Deferred compensation plan assets | 16.6 | 12.4
Level 1 |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Deferred compensation plan assets | 16.6 | 12.4
Level 1 | Mutual funds |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Deferred compensation plan assets | 16.6 | 12.4
NAV | Money market mutual funds |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Deferred compensation plan assets | $ 5.7 | $ 10.3

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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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