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Restructuring Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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May 05, 2018 | Apr. 29, 2017
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | $ 6.5 | $ 0.0
Signet Path to Brillance |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring plan, length | 3 years |
Minimum | Signet Path to Brillance |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | $ 170.0 |
Cash payments | $ 105.0 |
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 | $ 120.0 |
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 | 60.0 |
Cost Reduction Activities | Maximum | Signet Path to Brillance |  |
Restructuring Cost and Reserve [Line Items] |  |
Restructuring charges | 135.0 |
Cash payments | $ 65.0 |

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