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Segment information - Additional Information (Details) | 9 Months Ended
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Oct. 28, 2017 state segment province
Segment Reporting [Abstract] |
Number of reportable segments | segment | 5
Number of states in which entity operates | state | 50
Number of provinces in which entity operates | province | 9

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- Definition Number of Provinces in which Entity Operates + References No definition available. + Details
Name: | sig_NumberofProvincesinwhichEntityOperates
Namespace Prefix: | sig_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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 The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration