Commitments and Contingencies Diamond Sourcing Activities (Details) $ in Millions	12 Months Ended
Jan. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Diamond Purchase Commitments Amount Committed	$ 45.0

The estimated amount as of the balance sheet date that the entity must expend to satisfy the terms of diamond purchase arrangements (excluding long-term commitments) in which the entity has agreed to expend funds to procure diamonds from one or more suppliers.

No definition available.

Name:	tif_DiamondPurchaseCommitmentsAmountCommitted
Namespace Prefix:	tif_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration