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Fair value measurements - Narrative (Details) $ in Millions	Aug. 04, 2018 USD ($)
Fair Value Disclosures [Abstract]
Deferred payment, fair value disclosure	$ 17.1

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

- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration