Commitments and Contingencies - Litigation (Detail) SFr in Millions, $ in Millions	9 Months Ended	12 Months Ended
	Oct. 31, 2017 EUR (€)	Jan. 31, 2014 USD ($)	Jan. 31, 2014 CHF (SFr)	Oct. 31, 2017 USD ($)	Oct. 31, 2017 CHF (SFr)
Loss Contingencies [Line Items]
Loss Contingency, Damages Paid, Value | SFr			SFr 402.7
Arbitration award expense | $		$ 480.2
Litigation Settlement, Amount | €	€ 6,340
Swatch Parties [Member]
Loss Contingencies [Line Items]
Minimum Damage Claim Sought By Third Party				$ 73.0	SFr 73.0
Maximum Damage Claim Sought By Third Party				3,800.0	3,800.0
Tiffany Parties [Member]
Loss Contingencies [Line Items]
Minimum Damage Claim Sought				121.0	120.0
Maximum Damage Claim Sought				$ 543.0	SFr 540.0