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Cover Page - USD ($)
 12 Months Ended
Jan. 28, 2023
Mar. 10, 2023
Jul. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jan. 28, 2023    
Current Fiscal Year End Date --01-28    
Document Transition Report false    
Entity File Number 1-32349    
Entity Registrant Name SIGNET JEWELERS LIMITED    
Entity Incorporation, State or Country Code D0    
Entity Address, Address Line One Clarendon House    
Entity Address, Address Line Two 2 Church Street    
Entity Address, City or Town Hamilton    
Entity Address, Postal Zip Code HM11    
Entity Address, Country BM    
City Area Code 441    
Local Phone Number 296 5872    
Title of 12(b) Security Common Shares of $0.18 each    
Trading Symbol SIG    
Security Exchange Name NYSE    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 2,741,129,311
Entity Common Stock, Shares outstanding   45,221,840  
Documents Incorporated by Reference Portions of the Registrant’s proxy statement for its 2023 annual meeting of shareholders which will be filed with the Securities and Exchange Commission within 120 days after January 28, 2023 are incorporated by reference into Part III.    
Amendment Flag false    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Entity Central Index Key 0000832988