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Fair value measurement (Tables)
6 Months Ended
Jul. 29, 2023
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:
July 29, 2023January 28, 2023July 30, 2022
(in millions)Carrying ValueLevel 1Level 2Carrying ValueLevel 1Level 2Carrying ValueLevel 1Level 2
Assets:
US Treasury securities
$5.7 $5.7 $ $5.7 $5.7 $— $3.4 $3.4 $— 
Foreign currency contracts
   0.1 — 0.1 1.9 — 1.9 
US government agency securities
0.5  0.5 0.5 — 0.5 2.0 — 2.0 
Corporate bonds and notes
2.9  2.9 3.4 — 3.4 4.5 — 4.5 
Total assets
$9.1 $5.7 $3.4 $9.7 $5.7 $4.0 $11.8 $3.4 $8.4 
Liabilities:
Foreign currency contracts
$(1.0)$ $(1.0)$(0.7)$— $(0.7)$— $— $— 
Total liabilities$(1.0)$ $(1.0)$(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:
July 29, 2023January 28, 2023July 30, 2022
(in millions) Carrying
Value
Fair ValueCarrying
Value
Fair ValueCarrying
Value
Fair Value
Long-term debt:
Senior notes (Level 2)
$147.5 $145.1 $147.4 $144.9 $147.2 $146.2