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Acquisitions - Acquisition Consideration (Details) (Zale, USD $)
In Millions, except Per Share data, unless otherwise specified
 0 Months Ended
May 29, 2014
Zale
  
Business Acquisition [Line Items]  
Cash consideration paid to Zale Corporation shareholders ($21 per share) $ 910.2us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
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Cash consideration paid for settlement of Zale Corporation stock options, restricted share awards and long term incentive plan awards 69.6sig_BusinessCombinationSettlementofSharebasedCompensation
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Cash paid to extinguish Zale Corporation outstanding debt as of May 29, 2014 478.2us-gaap_ExtinguishmentOfDebtAmount
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Total consideration transferred $ 1,458.0us-gaap_BusinessCombinationConsiderationTransferred1
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Consideration received by acquiree shareholders (in dollars per share) $ 21sig_ConsiderationReceivedByAcquireeShareholdersPerShare
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