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Goodwill and Intangible Assets - Schedule of Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 26, 2020	Jul. 28, 2019	Jul. 26, 2020	Jul. 28, 2019	Jan. 26, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible amortization	$ 2,020	$ 3,908	$ 4,860	$ 9,051
Total expected amortization expense	15,152		15,152		$ 20,012
Core technologies
Finite-Lived Intangible Assets [Line Items]
Intangible amortization	1,798	3,475	4,271	7,634
Fiscal year 2021 (remaining six months)	3,406		3,406
Fiscal year 2022	4,942		4,942
Fiscal year 2023	4,002		4,002
Fiscal year 2024	1,676		1,676
Fiscal year 2025	287		287
Thereafter	839		839
Total expected amortization expense	15,152		15,152		19,423
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Intangible amortization	222	$ 433	589	$ 1,417
Total expected amortization expense	$ 0		$ 0		$ 589

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Finite Lived Intangible Assets Amortization Expense After Year Four

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in remainder of current fiscal year.

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount of amortization for assets, excluding financial assets and goodwill, lacking physical substance with finite life expected to be recognized in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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