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Fair value measurement (Tables)
 3 Months Ended
May 04, 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:
May 4, 2024February 3, 2024April 29, 2023
(in millions)Carrying ValueLevel 1Level 2Carrying ValueLevel 1Level 2Carrying ValueLevel 1Level 2
Assets:
US Treasury securities
$5.2 $5.2 $— $5.3 $5.3 $— $5.8 $5.8 $— 
Foreign currency contracts
0.1 — 0.1 0.1 — 0.1 0.1 — 0.1 
US government agency securities
0.5 — 0.5 0.5 — 0.5 0.5 — 0.5 
Corporate bonds and notes
0.5 — 0.5 2.0 — 2.0 3.4 — 3.4 
Total assets
$6.3 $5.2 $1.1 $7.9 $5.3 $2.6 $9.8 $5.8 $4.0 
Liabilities:
Foreign currency contracts
$(0.3)$— $(0.3)$(0.3)$— $(0.3)$(0.7)$— $(0.7)
Total liabilities$(0.3)$— $(0.3)$(0.3)$— $(0.3)$(0.7)$— $(0.7)
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:
May 4, 2024February 3, 2024April 29, 2023
(in millions) Carrying
Value		Fair ValueCarrying
Value		Fair ValueCarrying
Value		Fair Value
4.70% Senior unsecured notes due in June 2024 (Level 2)
$147.8 $147.4 $147.7 $146.3 $147.5 $144.3