Fair value measurement (Tables)

12 Months Ended

Jan. 28, 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:

	January 28, 2023						January 29, 2022
(in millions)	Carrying Value		Level 1		Level 2		Carrying Value		Level 1		Level 2
Assets:
US Treasury securities	$	5.7	$	5.7	$	—	$	4.5	$	4.5	$	—
Foreign currency contracts	0.1		—		0.1		0.3		—		0.3
US government agency securities	0.5		—		0.5		2.0		—		2.0
Corporate bonds and notes	3.4		—		3.4		5.8		—		5.8
Total assets	$	9.7	$	5.7	$	4.0	$	12.6	$	4.5	$	8.1
Liabilities:
Foreign currency contracts	$	(0.7)	$	—	$	(0.7)	$	(1.3)	$	—	$	(1.3)
Total liabilities	$	(0.7)	$	—	$	(0.7)	$	(1.3)	$	—	$	(1.3)

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:

	January 28, 2023				January 29, 2022
(in millions)	Carrying Value		Fair Value		Carrying Value		Fair Value
Long-term debt
Senior Notes (Level 2)	$	147.4	$	144.9	$	147.1	$	150.0