Commitments and Contingencies - Summary of Earn-out Liability (Details) - USD ($) $ in Thousands	Jan. 26, 2020	Jan. 27, 2019
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	$ 2,108	$ 6,675
Earn-out liability expected to be settled within twelve months	2,108
Cycleo
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	2,108	4,514
Earn-out liability expected to be settled within twelve months	2,108
AptoVision
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	0	2,161
Earn-out liability expected to be settled within twelve months	0
Compensation Expense [Member]
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	1,830	4,052
Compensation Expense [Member] | Cycleo
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	1,830	4,052
Compensation Expense [Member] | AptoVision
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	0	0
Not Conditional Upon Future Employment [Member]
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	278	2,623
Not Conditional Upon Future Employment [Member] | Cycleo
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	278	462
Not Conditional Upon Future Employment [Member] | AptoVision
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	$ 0	$ 2,161