Segment Information - Schedule Of Revenue From External Customers By Sales Channel (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 26, 2020	Oct. 27, 2019	Jul. 28, 2019	Apr. 28, 2019	Jan. 27, 2019	Oct. 28, 2018	Jul. 29, 2018	Apr. 29, 2018	Jan. 26, 2020	Jan. 27, 2019	Jan. 28, 2018
Segment Reporting Information [Line Items]
Net sales	$ 138,001	$ 141,011	$ 137,146	$ 131,354	$ 160,006	$ 173,550	$ 163,211	$ 130,429	$ 547,512	$ 627,196	$ 587,847
Distributor
Segment Reporting Information [Line Items]
Net sales									392,582	442,518	390,618
Direct
Segment Reporting Information [Line Items]
Net sales									154,930	206,179	213,448
Other: Warrant Shares
Segment Reporting Information [Line Items]
Other: Warrant Shares									$ 0	$ 21,501	$ 16,219