Commitments and Contingencies - Summary of Earn-out Liability (Details) - USD ($) $ in Thousands	Jul. 01, 2017	Apr. 26, 2020	Jan. 26, 2020
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability recorded		$ 1,958	$ 2,108
Amount expected to be settled within twelve months		1,958
Compensation expense
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability recorded		1,713	1,830
Not conditional upon continued employment
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability recorded		245	$ 278
AptoVision
Business Acquisition, Contingent Consideration [Line Items]
Cash paid to to acquire business	$ 17,600
Payments for previous acquisition, to date		$ 9,400
AptoVision | Earn-out Payable Within First Three Fiscal Years Of Acquisition Date
Business Acquisition, Contingent Consideration [Line Items]
Potential payments under earn-out arrangements, high estimate	$ 47,000
Period over which contingent consideration will be paid	3 years