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Investments (Tables) | 6 Months Ended
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Oct. 30, 2021
Investments |
Schedule of investments | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | October 30, | ​ | April 30, | ​
​ |  | 2021 |  | 2021 |
Short-term investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Municipal securities | ​ | ​ | 6,311 | ​ | ​ | 22,245 | ​
U.S. government securities | ​ | ​ | — | ​ | ​ | 4,009 | ​
Corporate bonds | ​ | ​ | — | ​ | ​ | 5,717 | ​
Total short-term investments | ​ | $ | 6,311 | ​ | $ | 31,971 | ​
Long-term investments: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Available-for-sale securities: | ​ | ​ | ​ | ​ | ​ | ​ | ​
Municipal securities | ​ | ​ | — | ​ | ​ | 988 | ​
U.S. government securities | ​ | ​ | — | ​ | ​ | 4,000 | ​
Total long-term available-for-sale investments | ​ |  | — | ​ |  | 4,988 | ​
Equity method investments | ​ | ​ | ​ | ​ | ​ | ​ | ​
Investment in limited partnership fund | ​ |  | 11,271 | ​ |  | 7,168 | ​
Total equity method investments | ​ |  | 11,271 | ​ |  | 7,168 | ​
Total long-term investments | ​ | $ | 11,271 | ​ | $ | 12,156 | ​
Schedule of activity related to available-for-sale investments recorded in short-term and long-term investments | The following table is a summary of the activity related to the available-for-sale investments recorded in short-term and long-term investments as of October 30, 2021 and April 30, 2021, respectively (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | October 30, 2021 | ​ | ​
​ |  | ​ | ​ |  | Gross |  | Gross |  | ​ | ​ |  |
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair | ​ | ​
​ | ​ | Cost | ​ | Gains | ​ | Losses | ​ | Value | ​ | ​
Municipal securities | ​ | $ | 6,309 | ​ | $ | 2 | ​ | $ | — | ​ | $ | 6,311 | ​ | ​
Total available-for-sale investments | ​ | $ | 6,309 | ​ | $ | 2 | ​ | $ | — | ​ | $ | 6,311 | ​ | ​
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | April 30, 2021 | ​
​ | ​ | ​ | ​ | ​ | Gross | ​ | Gross | ​ | ​ | ​ | ​
​ | ​ | Amortized | ​ | Unrealized | ​ | Unrealized | ​ | Fair |
​ | ​ | Cost |  | Gains | ​ | Losses |  | Value |
Municipal securities |  | $ | 23,227 | ​ | $ | 8 | ​ | $ | (2) | ​ | $ | 23,233 | ​
U.S. government securities | ​ |  | 8,008 | ​ | ​ | 1 | ​ | ​ | — | ​ | ​ | 8,009 | ​
Corporate bonds | ​ |  | 5,718 | ​ | ​ | — | ​ | ​ | (1) | ​ | ​ | 5,717 | ​
Total available-for-sale investments |  | $ | 36,953 |  | $ | 9 | ​ | $ | (3) |  | $ | 36,959 | ​
Schedule of amortized cost and fair value of the available-for-sale debt securities by contractual maturity | The amortized cost and fair value of the available-for-sale debt securities by contractual maturity at October 30, 2021 were as follows (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Cost |  | Fair Value |
Due within one year | ​ | $ | 6,309 | ​ | $ | 6,311 | ​
Due after one year through five years | ​ |  | — | ​ |  | — | ​
Total | ​ | $ | 6,309 | ​ | $ | 6,311 | ​

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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 http://asc.fasb.org/extlink&oid=123583765&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 http://asc.fasb.org/extlink&oid=123583765&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 http://asc.fasb.org/extlink&oid=123583765&loc=SL75117539-209714 + Details
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