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Fair value measurement - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Aug. 04, 2018	May 02, 2020
Fair Value Disclosures [Abstract]
Sale of receivables. percentage deferred until second anniversary of closing date	5.00%
Deferred payment, fair value disclosure		$ 22.8

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