XML 84 R71.htm IDEA: XBRL DOCUMENT
v3.21.2

Income taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 30, 2021 | Jul. 31, 2021 | Oct. 31, 2020
Income Tax Disclosure [Abstract] |  |  |
Tax benefit for release of valuation allowance |  | $ 49.8 |
CARES Act, income tax benefit on Tax Cuts and Jobs Act |  |  | $ 73.8
CARES Act, income tax benefit on net operating losses | $ 12.4 |  | 23.5
Increase in valuation allowance |  |  | $ 66.9

X
- Definition CARES Act, Income Tax Expense (Benefit) on Net Operating Losses + References No definition available. + Details
Name: | sig_CARESActIncomeTaxExpenseBenefitonNetOperatingLosses
Namespace Prefix: | sig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition CARES Act, Income Tax Expense (Benefit) on Tax Cuts and Jobs Act + References No definition available. + Details
Name: | sig_CARESActIncomeTaxExpenseBenefitonTaxCutsandJobsAct
Namespace Prefix: | sig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
Name: | us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319 + Details
Name: | us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration