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Fair value measurement (Tables) | 6 Months Ended
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Jul. 29, 2023
Fair Value Disclosures [Abstract] |
Schedule of Methods to Determine Fair Value on Instrument-Specific Basis | The methods Signet uses to determine fair value on an instrument-specific basis are detailed below:
| July 29, 2023 |  | January 28, 2023 |  | July 30, 2022
(in millions) | Carrying Value |  | Level 1 |  | Level 2 |  | Carrying Value |  | Level 1 |  | Level 2 |  | Carrying Value |  | Level 1 |  | Level 2
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
US Treasury securities | $ | 5.7 |  |  | $ | 5.7 |  |  | $ | — |  |  | $ | 5.7 |  |  | $ | 5.7 |  |  | $ | — |  |  | $ | 3.4 |  |  | $ | 3.4 |  |  | $ | — |
Foreign currency contracts | — |  |  | — |  |  | — |  |  | 0.1 |  |  | — |  |  | 0.1 |  |  | 1.9 |  |  | — |  |  | 1.9 |
US government agency securities | 0.5 |  |  | — |  |  | 0.5 |  |  | 0.5 |  |  | — |  |  | 0.5 |  |  | 2.0 |  |  | — |  |  | 2.0 |
Corporate bonds and notes | 2.9 |  |  | — |  |  | 2.9 |  |  | 3.4 |  |  | — |  |  | 3.4 |  |  | 4.5 |  |  | — |  |  | 4.5 |
Total assets | $ | 9.1 |  |  | $ | 5.7 |  |  | $ | 3.4 |  |  | $ | 9.7 |  |  | $ | 5.7 |  |  | $ | 4.0 |  |  | $ | 11.8 |  |  | $ | 3.4 |  |  | $ | 8.4 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency contracts | $ | (1.0) |  |  | $ | — |  |  | $ | (1.0) |  |  | $ | (0.7) |  |  | $ | — |  |  | $ | (0.7) |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Total liabilities | $ | (1.0) |  |  | $ | — |  |  | $ | (1.0) |  |  | $ | (0.7) |  |  | $ | — |  |  | $ | (0.7) |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Schedule of Carrying Amount and Fair Value of Outstanding Debt | The following table provides a summary of the carrying amount and fair value of outstanding debt:
| July 29, 2023 |  | January 28, 2023 |  | July 30, 2022
(in millions) | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value |  | Carrying Value |  | Fair Value
Long-term debt: |  |  |  |  |  |  |  |  |  |  |
Senior notes (Level 2) | $ | 147.5 |  |  | $ | 145.1 |  |  | $ | 147.4 |  |  | $ | 144.9 |  |  | $ | 147.2 |  |  | $ | 146.2 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482907/825-10-50-11 + Details
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- Definition Tabular disclosure of information pertaining to carrying amount and estimated fair value of short-term and long-term debt instruments or arrangements, including but not limited to, identification of terms, features, and collateral requirements. + References No definition available. + Details
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