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Segment information - Summary of Activity by Segment (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 28, 2017 | Oct. 29, 2016 | Oct. 28, 2017 | Oct. 29, 2016 | Jan. 28, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | $ 1,156.9 | $ 1,186.2 | $ 3,959.9 | $ 4,138.5 |
Operating income (loss) | 5.5 | 32.1 | 256.4 | 364.0 |
Reversal of allowance on receivables previously held for sale |  |  | (30.9) | 0.0 |
Total assets | 5,800.7 | 6,487.5 | 5,800.7 | 6,487.5 | $ 6,597.8
Sterling Jewelers |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | 698.7 | 712.5 | 2,437.8 | 2,532.3 |
Operating income (loss) | 73.7 | 78.6 | 362.6 | 417.8 |
Total assets | 3,260.0 | 3,715.6 | 3,260.0 | 3,715.6 | 4,015.4
Zale Jewelry |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | 268.2 | 282.4 | 933.7 | 994.8 |
Operating income (loss) | (15.7) | (19.3) | (12.4) | (0.5) |
Total assets | 1,885.0 | 2,061.7 | 1,885.0 | 2,061.7 | 1,940.7
Piercing Pagoda |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | 55.4 | 53.4 | 187.4 | 179.4 |
Operating income (loss) | (4.2) | (5.4) | 0.0 | 2.2 |
Total assets | 139.8 | 136.1 | 139.8 | 136.1 | 141.6
UK Jewelry |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | 128.4 | 130.3 | 382.8 | 419.5 |
Operating income (loss) | (1.7) | 0.0 | (1.9) | 3.0 |
Total assets | 404.8 | 407.1 | 404.8 | 407.1 | 372.6
Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales | 6.2 | 7.6 | 18.2 | 12.5 |
Operating income (loss) | (46.6) | (21.8) | (91.9) | (58.5) |
Total assets | 111.1 | $ 167.0 | 111.1 | 167.0 | $ 127.5
Consumer Portfolio Segment |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Reversal of allowance on receivables previously held for sale |  |  | 20.7 | $ 0.0 |
Consumer Portfolio Segment | Sterling Jewelers |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Reversal of allowance on receivables previously held for sale | 10.2 |  | 20.7 |  |
Consumer Portfolio Segment | Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Transaction costs | (22.4) |  | (28.3) |  |
R2Net Inc. |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Acquisition related costs |  |  | 9.4 |  |
R2Net Inc. | Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Acquisition related costs | $ 8.1 |  |  |  |
Chief Executive Officer | Other |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Transition costs |  |  | $ 3.4 |  |

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