Document and Entity Information - USD ($)
12 Months Ended
Jan. 31, 2019
Mar. 18, 2019
Jul. 31, 2018
Document Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Jan. 31, 2019    
Document Fiscal Year Focus 2018    
Document Fiscal Period Focus FY    
Trading Symbol TIF    
Entity Registrant Name TIFFANY & CO    
Entity Central Index Key 0000098246    
Current Fiscal Year End Date --01-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   121,454,192  
Entity Public Float     $ 16,707,436,188
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false