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Organization and summary of significant accoutning policies - Narrative (Details) | 3 Months Ended | 12 Months Ended
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Feb. 02, 2019 USD ($) | May 05, 2018 USD ($) | Feb. 02, 2019 USD ($) Segment | Feb. 03, 2018 USD ($) | Jan. 28, 2017 USD ($)
Organization and critical accounting policies [Abstract] |  |  |  |  |
Number of reportable segments | Segment |  |  | 3 |  |
Revenue Recognition [Abstract] |  |  |  |  |
Sales returns reserve | $ 16,800,000 |  | $ 16,800,000 | $ 13,500,000 |
Percentage of revenue recognized within the first two years | 55.00% |  | 55.00% | 58.00% |
Advertising and promotional costs [Abstract] |  |  |  |  |
Advertising expense |  |  | $ 387,800,000 | $ 360,500,000 | $ 380,600,000
In-house customer finance programs [Abstract] |  |  |  |  |
Interest-free financing period |  |  | 1 year |  |
Accrued interest suspension period |  |  | 90 days |  |
Accounts Receivable [Abstract] |  |  |  |  |
Loss allowance, maturity period |  |  | 90 days |  |
Percentage allowance on losses |  |  | 100.00% |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Goodwill, impairment loss |  | $ 286,700,000 | $ (521,200,000) | $ 0 |
Minimum |  |  |  |  |
Organization and critical accounting policies [Abstract] |  |  |  |  |
Percent of annual sales | 35.00% |  |  |  |
Property, Plant and Equipment [Abstract] |  |  |  |  |
Period over which amortization is charged for capitalized payroll for internal use computer projects |  |  | 3 years |  |
Maximum |  |  |  |  |
Organization and critical accounting policies [Abstract] |  |  |  |  |
Percent of annual sales | 40.00% |  |  |  |
Property, Plant and Equipment [Abstract] |  |  |  |  |
Period over which amortization is charged for capitalized payroll for internal use computer projects |  |  | 5 years |  |
Sterling Jewelers |  |  |  |  |
Goodwill and Intangible Assets Disclosure [Abstract] |  |  |  |  |
Goodwill, impairment loss |  | 521,200,000 |  |  |
Impairment of intangible assets (excluding goodwill) |  | $ 214,200,000 |  |  |
Lifetime Warranty | Sterling Jewelers |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |
Deferred revenue recognition period |  |  | 17 years |  |

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