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Accrued Expenses and Other Current Liabilities - Additional Information (Detail) | 12 Months Ended
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Feb. 03, 2018
Payables and Accruals [Abstract] |
Lifetime diamond guarantee inspection period | 6 months

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- Definition US Division Required Inspection Period For Lifetime Gemstone Guarantee + References No definition available. + Details
Name: | sig_USDivisionRequiredInspectionPeriodForLifetimeGemstoneGuarantee
Namespace Prefix: | sig_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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