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Condensed consolidating financial information - Condensed Consolidated Income Statement (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 02, 2019 | Nov. 03, 2018 | Aug. 04, 2018 | May 05, 2018 | Feb. 03, 2018 | Oct. 28, 2017 | Jul. 29, 2017 | Apr. 29, 2017 | Feb. 02, 2019 | Feb. 03, 2018 | Jan. 28, 2017
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales | $ 2,154.7 | $ 1,191.7 | $ 1,420.1 | $ 1,480.6 | $ 2,293.1 | $ 1,156.9 | $ 1,399.6 | $ 1,403.4 | $ 6,247.1 | $ 6,253.0 | $ 6,408.4
Cost of sales |  |  |  |  |  |  |  |  | (4,024.1) | (4,063.0) | (4,047.6)
Gross margin | 877.8 | 371.2 | 427.0 | 484.8 | 919.8 | 321.1 | 457.9 | 491.2 | 2,160.8 | 2,190.0 | 2,360.8
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (1,985.1) | (1,872.2) | (1,880.2)
Credit transaction, net |  |  |  |  |  |  |  |  | (167.4) | 1.3 | 0.0
Restructuring charges |  |  |  |  |  |  |  |  | (63.7) | 0.0 | 0.0
Goodwill and intangible impairments |  |  |  | (448.7) |  |  |  |  | (735.4) | 0.0 | 0.0
Other operating income, net |  |  |  |  |  |  |  |  | 26.2 | 260.8 | 282.6
Operating income (loss) |  |  |  |  |  |  |  |  | (764.6) | 579.9 | 763.2
Intra-entity interest income (expense) |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Interest expense, net |  |  |  |  |  |  |  |  | (39.7) | (52.7) | (49.4)
Other non-operating income |  |  |  |  |  |  |  |  | 1.7 | 0.0 | 0.0
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (802.6) | 527.2 | 713.8
Income taxes |  |  |  |  |  |  |  |  | 145.2 | (7.9) | (170.6)
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Net income (loss) | $ (116.2) | $ (38.1) | $ (31.2) | $ (504.8) | $ 343.0 | $ (12.1) | $ 85.2 | $ 70.3 | (657.4) | 519.3 | 543.2
Dividends on redeemable convertible preferred shares |  |  |  |  |  |  |  |  | (32.9) | (32.9) | (11.9)
Net income (loss) attributable to common shareholders |  |  |  |  |  |  |  |  | (690.3) | 486.4 | 531.3
Consolidation, Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Cost of sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gross margin |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Credit transaction, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Restructuring charges |  |  |  |  |  |  |  |  | 0.0 |  |
Goodwill and intangible impairments |  |  |  |  |  |  |  |  | 0.0 |  |
Other operating income, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Operating income (loss) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Intra-entity interest income (expense) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Interest expense, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other non-operating income |  |  |  |  |  |  |  |  | 0.0 |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income taxes |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | 2,465.2 | (983.8) | (1,116.6)
Net income (loss) |  |  |  |  |  |  |  |  | 2,465.2 | (983.8) | (1,116.6)
Dividends on redeemable convertible preferred shares |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income (loss) attributable to common shareholders |  |  |  |  |  |  |  |  | 2,465.2 | (983.8) | (1,116.6)
Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 5,722.8 | 5,866.6 | 6,141.9
Cost of sales |  |  |  |  |  |  |  |  | (3,755.5) | (3,926.6) | (3,997.2)
Gross margin |  |  |  |  |  |  |  |  | 1,910.8 | 1,940.0 | 2,144.7
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (1,833.4) | (1,738.2) | (1,775.1)
Credit transaction, net |  |  |  |  |  |  |  |  | (167.4) | 1.3 |
Restructuring charges |  |  |  |  |  |  |  |  | (55.3) |  |
Goodwill and intangible impairments |  |  |  |  |  |  |  |  | (470.4) |  |
Other operating income, net |  |  |  |  |  |  |  |  | 22.5 | 260.3 | 293.8
Operating income (loss) |  |  |  |  |  |  |  |  | (593.2) | 463.4 | 663.4
Intra-entity interest income (expense) |  |  |  |  |  |  |  |  | (243.4) | (190.2) | (188.4)
Interest expense, net |  |  |  |  |  |  |  |  | (25.0) | (21.6) | (16.6)
Other non-operating income |  |  |  |  |  |  |  |  | 1.7 |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (859.9) | 251.6 | 458.4
Income taxes |  |  |  |  |  |  |  |  | 133.0 | (21.3) | (175.1)
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | (1,043.1) | 229.6 | 276.4
Net income (loss) |  |  |  |  |  |  |  |  | (1,770.0) | 459.9 | 559.7
Dividends on redeemable convertible preferred shares |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income (loss) attributable to common shareholders |  |  |  |  |  |  |  |  | (1,770.0) | 459.9 | 559.7
Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 524.3 | 386.4 | 266.5
Cost of sales |  |  |  |  |  |  |  |  | (268.6) | (136.4) | (50.4)
Gross margin |  |  |  |  |  |  |  |  | 250.0 | 250.0 | 216.1
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (150.7) | (132.1) | (103.8)
Credit transaction, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Restructuring charges |  |  |  |  |  |  |  |  | (8.4) |  |
Goodwill and intangible impairments |  |  |  |  |  |  |  |  | (265.0) |  |
Other operating income, net |  |  |  |  |  |  |  |  | 3.8 | 0.4 | (11.2)
Operating income (loss) |  |  |  |  |  |  |  |  | (170.3) | 118.3 | 101.1
Intra-entity interest income (expense) |  |  |  |  |  |  |  |  | 229.1 | 171.4 | 169.6
Interest expense, net |  |  |  |  |  |  |  |  | 0.2 | (11.2) | (13.0)
Other non-operating income |  |  |  |  |  |  |  |  | 0.0 |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 59.0 | 278.5 | 257.7
Income taxes |  |  |  |  |  |  |  |  | 13.0 | 13.2 | 4.3
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | (770.4) | 233.1 | 295.7
Net income (loss) |  |  |  |  |  |  |  |  | (698.4) | 524.8 | 557.7
Dividends on redeemable convertible preferred shares |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income (loss) attributable to common shareholders |  |  |  |  |  |  |  |  | (698.4) | 524.8 | 557.7
Signet Jewelers Limited | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Cost of sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gross margin |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | (1.0) | (1.9) | (1.3)
Credit transaction, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Restructuring charges |  |  |  |  |  |  |  |  | 0.0 |  |
Goodwill and intangible impairments |  |  |  |  |  |  |  |  | 0.0 |  |
Other operating income, net |  |  |  |  |  |  |  |  | (0.1) | 0.1 | 0.0
Operating income (loss) |  |  |  |  |  |  |  |  | (1.1) | (1.8) | (1.3)
Intra-entity interest income (expense) |  |  |  |  |  |  |  |  | (4.6) | 0.0 | 0.0
Interest expense, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other non-operating income |  |  |  |  |  |  |  |  | 0.0 |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | (5.7) | (1.8) | (1.3)
Income taxes |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | (651.7) | 521.1 | 544.5
Net income (loss) |  |  |  |  |  |  |  |  | (657.4) | 519.3 | 543.2
Net income (loss) attributable to common shareholders |  |  |  |  |  |  |  |  | (690.3) | 486.4 | 531.3
Signet UK Finance plc | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Cost of sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gross margin |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Credit transaction, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 |
Restructuring charges |  |  |  |  |  |  |  |  | 0.0 |  |
Goodwill and intangible impairments |  |  |  |  |  |  |  |  | 0.0 |  |
Other operating income, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Operating income (loss) |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Intra-entity interest income (expense) |  |  |  |  |  |  |  |  | 18.9 | 18.8 | 18.8
Interest expense, net |  |  |  |  |  |  |  |  | (14.9) | (19.9) | (19.8)
Other non-operating income |  |  |  |  |  |  |  |  | 0.0 |  |
Income (loss) before income taxes |  |  |  |  |  |  |  |  | 4.0 | (1.1) | (1.0)
Income taxes |  |  |  |  |  |  |  |  | (0.8) | 0.2 | 0.2
Equity in income of subsidiaries |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income (loss) |  |  |  |  |  |  |  |  | 3.2 | (0.9) | (0.8)
Dividends on redeemable convertible preferred shares |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income (loss) attributable to common shareholders |  |  |  |  |  |  |  |  | 3.2 | (0.9) | (0.8)
Restructuring |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | (62.2) | $ 0.0 | $ 0.0
Restructuring | Consolidation, Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 0.0 |  |
Restructuring | Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | (56.5) |  |
Restructuring | Non-Guarantor Subsidiaries | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | (5.7) |  |
Restructuring | Signet Jewelers Limited | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | 0.0 |  |
Restructuring | Signet UK Finance plc | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Cost of sales |  |  |  |  |  |  |  |  | $ 0.0 |  |

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