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Inventories - Rollforward of Inventory Reserves (Details) - USD ($) $ in Millions | 12 Months Ended
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Feb. 02, 2019 | Feb. 03, 2018 | Jan. 28, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | $ 40.6 | $ 43.2 | $ 43.2
Charged to profit | 131.4 | 75.8 | 57.3
Utilization | (76.7) | (78.4) | (57.3)
Balance at end of period | 95.3 | $ 40.6 | $ 43.2
Signet Path to Brillance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Charged to profit | 62.2 |  |
Utilization | (10.6) |  |
Balance at end of period | $ 51.6 |  |

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of increase in valuation and qualifying accounts and reserves from charge to cost and expense. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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