Basis of Presentation and Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Aug. 02, 2020 USD ($)	May 03, 2020	Aug. 02, 2020 USD ($) numberOfRevenueSources	Jul. 31, 2019 USD ($)	Feb. 02, 2020 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Depreciation and amortization			$ 31,597	$ 43,591
Restricted cash	$ 15,287		$ 15,287		$ 15,287
Number of revenue sources | numberOfRevenueSources			2
Test equipment, computer equipment and software
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life of assets		4 years
Test equipment, computer equipment and software | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life of assets					2 years
Test equipment, computer equipment and software | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life of assets					3 years
Change in accounting estimate
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Depreciation and amortization	$ (6,300)		$ (14,100)