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Restructuring Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Aug. 04, 2018 | Jul. 29, 2017 | Aug. 04, 2018 | Jul. 29, 2017
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | $ 77.4 | $ 0.0
Signet Path to Brillance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring plan, length |  |  | 3 years |
Restructuring charges | $ 82.8 | $ 0.0 | $ 89.3 | $ 0.0
Minimum | Signet Path to Brillance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | 170.0 |
Cash payments |  |  | $ 80.0 |
Net reduction in net selling square feet, percent |  |  | 4.00% |
Maximum | Signet Path to Brillance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | $ 190.0 |
Cash payments |  |  | $ 95.0 |
Net reduction in net selling square feet, percent |  |  | 5.00% |
Cost Reduction Activities | Minimum | Signet Path to Brillance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | $ 125.0 |
Cash payments |  |  | 40.0 |
Cost Reduction Activities | Maximum | Signet Path to Brillance |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |
Restructuring charges |  |  | 135.0 |
Cash payments |  |  | $ 45.0 |

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