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Organization and summary of significant accoutning policies - Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 05, 2016 USD ($) shares | Feb. 03, 2018 | Oct. 28, 2017 | Jul. 29, 2017 | Apr. 29, 2017 | Jan. 28, 2017 | Jan. 30, 2016 | Feb. 03, 2018 USD ($) Segment | Jan. 28, 2017 USD ($) | Jan. 30, 2016 USD ($)
Organization and critical accounting policies [Abstract] |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  |  | 5 |  |
Percent of annual sales |  | 40.00% | 20.00% | 20.00% | 20.00% |  |  |  |  |
Advertising and promotional costs [Abstract] |  |  |  |  |  |  |  |  |  |
Advertising expense |  |  |  |  |  |  |  | $ 360.5 | $ 380.6 | $ 384.2
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% |  |
Minimum |  |  |  |  |  |  |  |  |  |
Organization and critical accounting policies [Abstract] |  |  |  |  |  |  |  |  |  |
Operating income expected in fourth quarter |  |  |  |  |  |  |  | 45.00% |  |
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] |  |  |  |  |  |  |  |  |  |
Operating income expected in fourth quarter |  |  |  |  |  |  |  | 55.00% |  |
Property, Plant and Equipment [Abstract] |  |  |  |  |  |  |  |  |  |
Period over which amortization is charged for capitalized payroll for internal use computer projects |  |  |  |  |  |  |  | 5 years |  |
Sterling Jewelers | Minimum |  |  |  |  |  |  |  |  |  |
Organization and critical accounting policies [Abstract] |  |  |  |  |  |  |  |  |  |
Operating income expected in fourth quarter |  |  |  |  |  |  |  | 40.00% |  |
Sterling Jewelers | Maximum |  |  |  |  |  |  |  |  |  |
Organization and critical accounting policies [Abstract] |  |  |  |  |  |  |  |  |  |
Operating income expected in fourth quarter |  |  |  |  |  |  |  | 45.00% |  |
Theft Protection | Zale |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |
Product warranty |  |  |  |  |  |  |  | 2 years |  |
Lifetime Warranty | Sterling Jewelers |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |
Deferred revenue recognition period of extended service plan sales |  |  |  |  |  | 2 years |  | 17 years |  |
Revenue recognized percentage In relation to costs expected to be incurred within first two years |  |  |  |  |  | 57.00% | 57.00% | 57.00% | 42.00% | 42.00%
Lifetime Warranty | Zale |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |
Revenue recognized percentage In relation to costs expected to be incurred within first two years |  |  |  |  |  |  |  | 69.00% | 69.00% | 69.00%
Product warranty |  |  |  |  |  |  |  | 10 years |  |
Watch Warranty | Zale |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |
Product warranty |  |  |  |  |  |  |  | 2 years |  |
Breakage Warranty | Zale |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |
Product warranty |  |  |  |  |  |  |  | 1 year |  |
Jewelry Replacement Plan | Sterling Jewelers |  |  |  |  |  |  |  |  |  |
Revenue Recognition [Abstract] |  |  |  |  |  |  |  |  |  |
Deferred revenue recognition period of extended service plan sales |  |  |  |  |  |  |  | 3 years |  |
Series A Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |
Temporary Equity [Abstract] |  |  |  |  |  |  |  |  |  |
Redeemable convertible preferred stock, shares issued | shares | 625,000 |  |  |  |  |  |  |  |  |
Preferred stock, purchase price | $ 625.0 |  |  |  |  |  |  |  |  |

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