Commitments and Contingencies - Summary of Earn-out Liability (Details) - USD ($) $ in Thousands	Jan. 27, 2019	Jan. 28, 2018
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	$ 6,675	$ 26,520
Earn-out liability expected to be settled within twelve months	3,276
Cycleo
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	4,514	5,520
Earn-out liability expected to be settled within twelve months	1,978
AptoVision
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	2,161	21,000
Earn-out liability expected to be settled within twelve months	1,298
Compensation Expense [Member]
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	4,052	4,408
Compensation Expense [Member] | Cycleo
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	4,052	4,408
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	2,623	21,668
Not Conditional Upon Future Employment [Member] | Cycleo
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	462	668
Not Conditional Upon Future Employment [Member] | AptoVision
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	2,161	21,000
Interest Expense [Member]
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	0	444
Interest Expense [Member] | Cycleo
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	0	444
Interest Expense [Member] | AptoVision
Business Acquisition, Contingent Consideration [Line Items]
Earn-out liability	$ 0	$ 0