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Segment information - Information by Segment additional information (Details) (Operating Segments, USD $)
In Millions, unless otherwise specified
 3 Months Ended
May 02, 2015
May 03, 2014
Zale Jewelry
    
Segment Reporting Information [Line Items]    
Operating loss related to purchase accounting adjustments $ 9.1sig_ImpactOfPurchaseAccountingAdjustmentsOnOperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= sig_ZaleJewelryMember		  
Piercing Pagoda
    
Segment Reporting Information [Line Items]    
Operating loss related to purchase accounting adjustments 2.3sig_ImpactOfPurchaseAccountingAdjustmentsOnOperatingIncomeLoss
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= sig_PiercingPagodaMember		  
Other
    
Segment Reporting Information [Line Items]    
Transaction related and integration expense $ 6.4sig_AcquisitionIntegrationAndSeveranceRelatedCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember		 $ 8.4sig_AcquisitionIntegrationAndSeveranceRelatedCosts
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_AllOtherSegmentsMember