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Fair value measurement - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Aug. 04, 2018 | Oct. 31, 2020
Fair Value Disclosures [Abstract] |  |
Sale of receivables. percentage deferred until second anniversary of closing date | 5.00% |
Deferred payment, fair value disclosure |  | $ 23.5

X
- Definition Deferred Payment, Fair Value Disclosure + References No definition available. + Details
Name: | sig_DeferredPaymentFairValueDisclosure
Namespace Prefix: | sig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Sale of Receivables. Percentage Deferred Until Second Anniversary + References No definition available. + Details
Name: | sig_SaleofReceivables.PercentageDeferredUntilSecondAnniversary
Namespace Prefix: | sig_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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