Share-Based Compensation - Allocation of Share-Based Compensation (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 28, 2019	Apr. 29, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Document Period End Date	Apr. 28, 2019
Share-based compensation expense	$ 11,328	$ 35,516
Revenue Offset
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	0	21,501
Cost of Sales [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	427	328
Selling, General and Administrative Expenses [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	8,344	11,462
Product Development And Engineering [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Share-based compensation expense	$ 2,557	$ 2,225