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Restructuring plans - Restructuring and Related Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 42 Months Ended
--- | --- | --- | ---
Jul. 31, 2021 | Aug. 01, 2020 | Jul. 31, 2021 | Aug. 01, 2020 | Jul. 31, 2021
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total Signet Path to Brilliance Plan expenses | $ (0.9) | $ 28.9 | $ (1.6) | $ 41.6 |
Cost of sales |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Inventory charges |  |  | 0.0 | (0.6) |
Restructuring Charges |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Other Plan related expenses |  |  | (1.6) | 41.6 |
Signet Path to Brilliance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total Signet Path to Brilliance Plan expenses | (0.9) | 28.7 | (1.6) | $ 41.0 | $ 251.0
Signet Path to Brilliance | Cost of sales |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Inventory charges | 0.0 | (0.2) |  |  |
Signet Path to Brilliance | Restructuring Charges |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Other Plan related expenses | (0.9) | $ 28.9 |  |  |
Inventory charges | Signet Path to Brilliance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total Signet Path to Brilliance Plan expenses | 0.0 |  | 0.0 |  | 72.8
Termination benefits | Signet Path to Brilliance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total Signet Path to Brilliance Plan expenses | (0.4) |  | (1.1) |  | 48.8
Store closure and other costs | Signet Path to Brilliance |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |
Total Signet Path to Brilliance Plan expenses | $ (0.5) |  | $ (0.5) |  | $ 129.4

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- Definition Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116847112&loc=d3e4542-108314 + Details
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