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Fair value measurement (Tables)
 6 Months Ended
Aug. 03, 2024
Fair Value Disclosures [Abstract]  
Schedule of Methods to Determine Fair Value on Instrument-Specific Basis The methods Signet uses to determine fair value on an instrument-specific basis are detailed below:
August 3, 2024February 3, 2024July 29, 2023
(in millions)Carrying ValueLevel 1Level 2Carrying ValueLevel 1Level 2Carrying ValueLevel 1Level 2
Assets:
US Treasury securities
$5.3 $5.3 $— $5.3 $5.3 $— $5.7 $5.7 $— 
Foreign currency contracts
— — — 0.1 — 0.1 — — — 
US government agency securities
— — — 0.5 — 0.5 0.5 — 0.5 
Corporate bonds and notes
0.2 — 0.2 2.0 — 2.0 2.9 — 2.9 
Total assets
$5.5 $5.3 $0.2 $7.9 $5.3 $2.6 $9.1 $5.7 $3.4 
Liabilities:
Foreign currency contracts
$(0.4)$— $(0.4)$(0.3)$— $(0.3)$(1.0)$— $(1.0)
Total liabilities$(0.4)$— $(0.4)$(0.3)$— $(0.3)$(1.0)$— $(1.0)
Schedule of Carrying Amount and Fair Value of Outstanding Debt The following table provides a summary of the carrying amount and fair value of outstanding debt:
February 3, 2024July 29, 2023
(in millions) Carrying
Value		Fair ValueCarrying
Value		Fair Value
4.70% Senior unsecured notes due in June 2024 (Level 2) (1)
$147.7 $146.3 $147.5 $145.1 
(1)    The Senior Notes were repaid during the second quarter of Fiscal 2025. See Note 15 for additional information.