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Revenue recognition - Unamortized Deferred Selling Costs (Details) - USD ($) $ in Millions | May 04, 2019 | Feb. 02, 2019 | May 05, 2018
--- | --- | --- | ---
Revenue from Contract with Customer [Abstract] |  |  |
Other current assets | $ 23.8 | $ 23.8 | $ 30.6
Other assets | 76.4 | 75.4 | 89.2
Deferred ESP selling costs | $ 100.2 | $ 99.2 | $ 119.8

X
- 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
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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
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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