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Fair Value Measurements - Fair Value of Available-for-Sale Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Aug. 03, 2019 | Apr. 27, 2019
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | $ 143,276 |
Over One Year Through Five Years | 53,372 |
Over Five Years | 0 |
Debt Securities, Available-for-sale | 196,648 |
U.S. Treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | 44,772 |
Over One Year Through Five Years | 5,135 |
Over Five Years |  | $ 0
Debt Securities, Available-for-sale | 49,907 |
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | 29,761 |
Over One Year Through Five Years | 0 |
Over Five Years |  | 0
Debt Securities, Available-for-sale | 29,761 |
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | 5,412 |
Over One Year Through Five Years | 37,320 |
Over Five Years |  | 0
Debt Securities, Available-for-sale | 42,732 |
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
One Year or Less | 63,331 |
Over One Year Through Five Years | 10,917 |
Over Five Years |  | $ 0
Debt Securities, Available-for-sale | $ 74,248 |

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- Definition Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27198-111563 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27161-111563 + Details
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