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Organization and principal accounting policies - Additional information (Details) | 9 Months Ended
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Nov. 03, 2018 segment
Property, Plant and Equipment [Line Items] |
Current Fiscal Year End Date | --02-02
Number of reportable segments | 3
Minimum |
Property, Plant and Equipment [Line Items] |
Seasonal revenues, fourth quarter sales, percent | 3500.00%
Maximum |
Property, Plant and Equipment [Line Items] |
Seasonal revenues, fourth quarter sales, percent | 40.00%

X
- Definition End date of current fiscal year in the format --MM-DD. + References No definition available. + Details
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Namespace Prefix: | dei_
Data Type: | xbrli:gMonthDayItemType
Balance Type: | na
Period Type: | duration

X
- Definition Seasonal Revenues, Fourth Quarter Sales, Percent + References No definition available. + Details
Name: | sig_SeasonalRevenuesFourthQuarterSalesPercent
Namespace Prefix: | sig_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |