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Goodwill and Intangible Assets - Future Amortization Expense for Intangible Assets (Details) - USD ($) $ in Thousands | Jan. 26, 2020 | Jan. 27, 2019
--- | --- | ---
Fiscal year 2021 | $ 8,266 |
Fiscal year 2022 | 4,942 |
Fiscal year 2023 | 4,002 |
Fiscal year 2024 | 1,676 |
Fiscal year 2025 | 1,126 |
Total expected amortization expense | 20,012 | $ 34,258
Core technologies |  |
Fiscal year 2021 | 7,677 |
Fiscal year 2022 | 4,942 |
Fiscal year 2023 | 4,002 |
Fiscal year 2024 | 1,676 |
Fiscal year 2025 | 1,126 |
Total expected amortization expense | 19,423 | 31,386
Customer relationships |  |
Fiscal year 2021 | 589 |
Fiscal year 2022 | 0 |
Fiscal year 2023 | 0 |
Fiscal year 2024 | 0 |
Fiscal year 2025 | 0 |
Total expected amortization expense | $ 589 | $ 2,872

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