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Revenue recognition - Unamortized Deferred Selling Costs (Details) - USD ($) $ in Millions | Aug. 04, 2018 | Feb. 03, 2018 | Jul. 29, 2017
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Revenue from Contract with Customer [Abstract] |  |  |
Other current assets | $ 30.3 | $ 30.9 | $ 29.7
Other assets | 88.4 | 89.5 | 87.2
Deferred ESP selling costs | $ 118.7 | $ 120.4 | $ 116.9

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- Definition Deferred Revenue Extended Service Plan Costs Noncurrent + References No definition available. + Details
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Namespace Prefix: | sig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of other miscellaneous assets expected to be realized or consumed within one year or operating cycle, if longer. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of other miscellaneous assets expected to be realized or consumed after one year or normal operating cycle, if longer. + References No definition available. + Details
Name: | us-gaap_OtherAssetsMiscellaneousNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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