| Component: (Network and Table) | |
|---|---|
| Network | 2419402 - Disclosure - Pension Plans - Change in UK Plan Assets (Details) (http://www.signetjewelers.com/role/PensionPlansChangeInUkPlanAssetsDetails) | 
| Table | Schedule of Defined Benefit Plans Disclosures [Table] | 
| Reporting Entity [Axis] | 0000832988 (http://www.sec.gov/CIK) | 
| Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] | Foreign Pension Plan, Defined Benefit | 
| Defined Benefit Plan Disclosure [Line Items] | Period [Axis] | |
|---|---|---|
| 2016-01-31 - 2017-01-28 | 2015-02-01 - 2016-01-30 | |
| Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] | ||
| Fair value at beginning of year | ||
| Actual return on UK Plan assets | ( | |
| Employer contributions | ||
| Members’ contributions | ||
| Benefits paid | ( | ( | 
| Foreign currency translation | ( | ( | 
| Fair value at end of year | 266,200,000   | |