Document and Entity Information - USD ($)	12 Months Ended
	Jan. 31, 2018	Mar. 12, 2018	Jul. 31, 2017
Document Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jan. 31, 2018
Document Fiscal Year Focus	2017
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		124,398,512
Entity Public Float			$ 11,993,601,775