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Accrued Expenses and Other Current Liabilities - Summary of Activity in Sales Returns Reserve (Details) - USD ($) $ in Millions | 12 Months Ended
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Feb. 03, 2018 | Jan. 28, 2017 | Jan. 30, 2016
Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Beginning balance | $ 13.0 | $ 14.0 | $ 15.3
Net adjustment | 0.5 | (1.0) | (1.3)
Ending balance | $ 13.5 | $ 13.0 | $ 14.0

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- Definition Sales Returns Reserve + References No definition available. + Details
Name: | sig_SalesReturnsReserve
Namespace Prefix: | sig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Sales Returns Reserve Net Adjustment + References No definition available. + Details
Name: | sig_SalesReturnsReserveNetAdjustment
Namespace Prefix: | sig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
Name: | us-gaap_MovementInValuationAllowancesAndReservesRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration