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v3.19.1

Revenue recognition - Rollforward (Details) - USD ($) $ in Millions | 12 Months Ended
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Feb. 02, 2019 | Feb. 03, 2018
Movement in Deferred Revenue [Roll Forward] |  |
ESP deferred revenue, beginning of period | $ 916.1 | $ 905.6
Plans sold | 395.0 | 409.3
Revenue recognized | (383.5) | (398.8)
ESP deferred revenue, end of period | $ 927.6 | $ 916.1

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- Definition Deferred Revenue Warranty + References No definition available. + Details
Name: | sig_DeferredRevenueWarranty
Namespace Prefix: | sig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Product Warranty, Revenues Recognized + References No definition available. + Details
Name: | sig_ProductWarrantyRevenuesRecognized
Namespace Prefix: | sig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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_MovementInDeferredRevenueRollForward
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of increase in the standard and extended product warranty accrual from warranties issued. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph ((c)(3)) -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration