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Fair Value Measurements (Tables) | 3 Months Ended
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Jul. 25, 2020
Fair Value Disclosures [Abstract] |
Fair value hierarchy for assets and liabilities measured at fair value on a recurring basis | The following table presents the fair value hierarchy for those assets we measured at fair value on a recurring basis at July 25, 2020 and April 25, 2020. There were no transfers into or out of Level 1, Level 2, or Level 3 for any of the periods presented.
At July 25, 2020 |  |  |  |  |  |  |  |  |  |
|  | Fair Value Measurements
(Unaudited, amounts in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | NAV(1) |  | Total
Assets |  |  |  |  |  |  |  |  |  |
Marketable securities |  | $ | — |  |  | $ | 20,608 |  |  | $ | — |  |  | $ | 7,195 |  |  | $ | 27,803 |
Held-to-maturity investments |  | 2,476 |  |  | — |  |  | — |  |  | — |  |  | 2,476 |
Cost basis investments |  | — |  |  | — |  |  | 7,579 |  |  | — |  |  | 7,579 |
Total assets |  | $ | 2,476 |  |  | $ | 20,608 |  |  | $ | 7,579 |  |  | $ | 7,195 |  |  | $ | 37,858 |
At April 25, 2020 |  |  |  |  |  |  |  |  |  |
|  | Fair Value Measurements
(Unaudited, amounts in thousands) |  | Level 1 |  | Level 2 |  | Level 3 |  | NAV(1) |  | Total
Assets |  |  |  |  |  |  |  |  |  |
Marketable securities |  | $ | — |  |  | $ | 31,691 |  |  | $ | — |  |  | $ | 6,515 |  |  | $ | 38,206 |
Held-to-maturity investments |  | 3,337 |  |  | — |  |  | — |  |  | — |  |  | 3,337 |
Cost basis investment |  | — |  |  | — |  |  | 6,479 |  |  | — |  |  | 6,479 |
Total assets |  | $ | 3,337 |  |  | $ | 31,691 |  |  | $ | 6,479 |  |  | $ | 6,515 |  |  | $ | 48,022 |
(1) Certain marketable securities investments are measured at fair value using net asset value per share under the practical expedient methodology.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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