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- Deferred revenue (Detail) (USD $)
In Millions, unless otherwise specified
May 02, 2015
Jan. 31, 2015
May 03, 2014
Feb. 01, 2014
Deferred Revenue Arrangement [Line Items]        
Voucher promotions and other $ 21.3sig_DeferredRevenueVoucherPromotionsAndOther $ 22.7sig_DeferredRevenueVoucherPromotionsAndOther $ 12.1sig_DeferredRevenueVoucherPromotionsAndOther  
Total deferred revenue 841.3us-gaap_DeferredRevenue 811.9us-gaap_DeferredRevenue 631.7us-gaap_DeferredRevenue  
Current liabilities 244.0us-gaap_DeferredRevenueCurrent 248.0us-gaap_DeferredRevenueCurrent 174.4us-gaap_DeferredRevenueCurrent  
Non-current liabilities 597.3us-gaap_DeferredRevenueNoncurrent 563.9us-gaap_DeferredRevenueNoncurrent 457.3us-gaap_DeferredRevenueNoncurrent  
Sterling Jewelers        
Deferred Revenue Arrangement [Line Items]        
ESP deferred revenue 690.7sig_DeferredRevenueWarranty
/ us-gaap_StatementBusinessSegmentsAxis
= sig_SterlingJewelersMember		 668.9sig_DeferredRevenueWarranty
/ us-gaap_StatementBusinessSegmentsAxis
= sig_SterlingJewelersMember		 619.6sig_DeferredRevenueWarranty
/ us-gaap_StatementBusinessSegmentsAxis
= sig_SterlingJewelersMember		 601.2sig_DeferredRevenueWarranty
/ us-gaap_StatementBusinessSegmentsAxis
= sig_SterlingJewelersMember
Zale Jewelry        
Deferred Revenue Arrangement [Line Items]        
ESP deferred revenue $ 129.3sig_DeferredRevenueWarranty
/ us-gaap_StatementBusinessSegmentsAxis
= sig_ZaleJewelryMember		 $ 120.3sig_DeferredRevenueWarranty
/ us-gaap_StatementBusinessSegmentsAxis
= sig_ZaleJewelryMember		 $ 0sig_DeferredRevenueWarranty
/ us-gaap_StatementBusinessSegmentsAxis
= sig_ZaleJewelryMember