XML 98 R87.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Fair value measurements - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Aug. 04, 2018 | Nov. 03, 2018
Fair Value Disclosures [Abstract] |  |
Sale of receivables. percentage deferred until second anniversary | 5.00% |
Deferred payment, fair value disclosure |  | $ 17.8

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