Debt Credit Facilities (Details) ¥ in Millions, $ in Millions	12 Months Ended
	Jan. 31, 2017 CNY (¥)	Jan. 31, 2016 USD ($)	Jan. 31, 2017 USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 750.0
Short-term borrowings		$ 221.6	228.7
Three Year Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line Of Credit Facility Previous Borrowing Capacity		275.0
Five Year Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line Of Credit Facility Previous Borrowing Capacity		275.0
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		667.8	653.0
Letters of Credit		5.6	4.0
Line of Credit Facility, Amount Outstanding		$ 76.6	$ 93.0
Line of Credit Facility, Interest Rate at Period End	1.72%	1.54%	1.72%
Short-term borrowings		$ 76.6	$ 93.0
2013 Tiffany Shanghai Credit Agreement [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity		99.3
Line of Credit Facility, Amount Outstanding		$ 42.1
Line of Credit Facility, Interest Rate at Period End		4.72%
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
Line of Credit Facility, Amount Outstanding			$ 40.2
Line of Credit Facility, Interest Rate at Period End	4.35%		4.35%
Line of Credit Facility, Maximum Borrowing Capacity	¥ 990.0		$ 143.8
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	2.99%	3.16%
Line of Credit Facility, Amount Outstanding		$ 102.9	95.5
Line of Credit Facility, Maximum Borrowing Capacity		126.6	137.3
Short-term borrowings		$ 145.0	$ 135.7
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%