Goodwill and Intangible Assets - Schedule of Amortization Expenses Recorded in the Statements of Income (Details) - USD ($)	12 Months Ended
Jan. 31, 2021	Jan. 26, 2020	Jan. 27, 2019
Schedule of Goodwill and Intangible Assets [Line Items]
Intangible amortization	$ 8,265,000	$ 16,546,000	$ 26,649,000
Core technologies
Schedule of Goodwill and Intangible Assets [Line Items]
Intangible amortization	7,676,000	14,263,000	20,916,000
Customer relationships
Schedule of Goodwill and Intangible Assets [Line Items]
Intangible amortization	$ 589,000	$ 2,283,000	$ 5,733,000

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.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
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Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

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