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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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