Segment Information - Revenue by Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 27, 2019	Oct. 28, 2018	Oct. 27, 2019	Oct. 28, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	$ 141,011	$ 173,550	$ 409,511	$ 467,190
Distributor
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	107,383	120,009	287,642	332,304
Direct
Revenues from External Customers and Long-Lived Assets [Line Items]
Net sales	33,628	53,541	121,869	156,387
Other: Warrant Shares
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue offset	$ 0	$ 0	$ 0	$ 21,501