Restructuring Provision - Summary of Corporate Initiative Costs by Operating Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2020	Apr. 30, 2020	Jul. 31, 2020
Restructuring Cost And Reserve [Line Items]
Provision	$ 7,368	$ 7,240	$ 14,608
Cost of Sales
Restructuring Cost And Reserve [Line Items]
Provision		3,508	3,508
Selling, General and Administrative
Restructuring Cost And Reserve [Line Items]
Provision	7,368	3,732	11,100
Watch and Accessory Brands
Restructuring Cost And Reserve [Line Items]
Provision	7,368	7,240	14,608
Watch and Accessory Brands | United States
Restructuring Cost And Reserve [Line Items]
Provision	6,631	4,704	11,335
Watch and Accessory Brands | International
Restructuring Cost And Reserve [Line Items]
Provision	$ 737	$ 2,536	$ 3,273