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Investments (Tables) | 9 Months Ended
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Jan. 28, 2023
Investments |
Schedule of investments | Investments consist of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | January 28, | ​ | April 30, | ​
​ |  | 2023 |  | 2022 |
Short-term investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Municipal securities | ​ | ​ | — | ​ | ​ | 19,725 | ​
U.S. government securities | ​ | ​ | — | ​ | ​ | 4,991 | ​
Total short-term investments | ​ | $ | — | ​ | $ | 24,716 | ​
Long-term investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Equity securities and warrants | ​ | ​ | 3,302 | ​ | ​ | — | ​
Total long-term available-for-sale securities investments | ​ |  | 3,302 | ​ |  | — | ​
Equity method investments | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investments in limited partnership funds | ​ |  | 16,017 | ​ |  | 15,433 | ​
Total equity method investments | ​ |  | 16,017 | ​ |  | 15,433 | ​
Total long-term investments | ​ | $ | 19,319 | ​ | $ | 15,433 | ​
​
Schedule of activity related to available-for-sale investments recorded in short-term | The following table is a summary of the activity related to the available-for-sale debt securities recorded in short-term investments as of April 30, 2022, respectively (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | April 30, 2022 | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
​ | ​ | Cost |  | Gains | ​ | Losses |  | Value |
Municipal securities |  | $ | 19,756 | ​ | $ | — | ​ | $ | (31) | ​ | $ | 19,725 | ​
U.S. government securities | ​ |  | 4,995 | ​ | ​ | — | ​ | ​ | (4) | ​ | ​ | 4,991 | ​
Total available-for-sale debt securities |  | $ | 24,751 |  | $ | — | ​ | $ | (35) |  | $ | 24,716 | ​
​
Schedule of equity securities and warrants are measured at fair value with net unrealized gains and losses from changes in the fair value recognized in other income | ​ Equity securities and warrants are measured at fair value with net unrealized gains and losses from changes in the fair value recognized in other (expense) income, net. ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months |  | Nine Months
​ | ​ | Ended |  | Ended
​ |  | January 28, |  | January 28,
​ | ​ | 2023 |  | 2023
Net loss recognized during the period on equity securities | ​ | $ | (2,726) | ​ | $ | (1,798)
Less: Net loss recognized during the period on equity securities sold during the period | ​ | ​ | — | ​ | ​ | —
Unrealized loss recognized during the period on equity securities still held at the reporting date | ​ | $ | (2,726) | ​ | $ | (1,798)

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- Definition Tabular disclosure of investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 321 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126980263&loc=SL75117539-209714 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 + Details
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