XML 123 R109.htm IDEA: XBRL DOCUMENT
v3.19.1

Investments - Summary of Available-for-sale Securities (Details) - USD ($) $ in Millions | Feb. 02, 2019 | Feb. 03, 2018
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Cost | $ 15.7 | $ 28.1
Unrealized Gain (Loss) | (0.9) | (0.2)
Fair Value | 14.8 | 27.9
US Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 5.1 | 8.3
Unrealized Gain (Loss) | (0.4) | (0.8)
Fair Value | 4.7 | 7.5
US government agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 2.6 | 5.3
Unrealized Gain (Loss) | (0.1) | (0.2)
Fair Value | 2.5 | 5.1
Corporate bonds and notes |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 5.3 | 11.0
Unrealized Gain (Loss) | (0.1) | (0.2)
Fair Value | 5.2 | 10.8
Corporate equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Cost | 2.7 | 3.5
Unrealized Gain (Loss) | (0.3) | 1.0
Fair Value | $ 2.4 | $ 4.5

X
- Definition Available-for-sale Securities, Accumulated Gross Unrealized Gain (Loss) + References No definition available. + Details
Name: | sig_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainLoss
Namespace Prefix: | sig_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_ScheduleOfAvailableForSaleSecuritiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_EquitySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |