Debt Credit Facilities (Details) ¥ in Millions, $ in Millions	12 Months Ended
	Jan. 31, 2018 CNY (¥)	Jan. 31, 2017 USD ($)	Jan. 31, 2018 USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 750.0
Short-term borrowings		$ 228.7	120.6
Four-year Credit Facility maturing October 2019 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			375.0
Line of Credit Facility, Expiration Date	Oct. 07, 2019
Five-year Credit Facility maturing October 2020 [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			375.0
Line of Credit Facility, Expiration Date	Oct. 07, 2020
Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity		653.0	709.7
Letters of Credit		4.0	6.8
Line of Credit Facility, Amount Outstanding		$ 93.0	$ 33.5
Line of Credit Facility, Interest Rate at Period End	1.10%	1.72%	1.10%
Short-term borrowings		$ 93.0	$ 33.5
2013 Tiffany Shanghai Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity | ¥	¥ 930.0
2016 Tiffany Shanghai Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity		103.6	112.7
Line of Credit Facility, Amount Outstanding		$ 40.2	$ 43.8
Line of Credit Facility, Interest Rate at Period End	4.35%	4.35%	4.35%
Line of Credit Facility, Maximum Borrowing Capacity	¥ 990.0		$ 156.5
Line of Credit Facility, Expiration Date	Jul. 11, 2019
Other Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate During Period	6.87%	2.99%
Line of Credit Facility, Amount Outstanding		$ 95.5	43.3
Line of Credit Facility, Maximum Borrowing Capacity		137.3	139.0
Short-term borrowings		$ 135.7	$ 87.1
Federal Funds Rate [Member] | Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, basis spread on Federal Funds Rate	0.50%		0.50%
London Interbank Offered Rate (LIBOR) [Member] | Credit Facilities [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, basis spread on LIBOR	1.00%		1.00%