Document and Entity Information	6 Months Ended
	Jul. 28, 2012	Aug. 15, 2012
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jul. 28, 2012
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Trading Symbol	SIG
Entity Registrant Name	SIGNET JEWELERS LTD
Entity Central Index Key	0000832988
Current Fiscal Year End Date	--02-02
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		80,893,691