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Note 12 - Fair Value Measurements (Tables) | 6 Months Ended
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Mar. 31, 2025
Notes Tables |
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] |
​ |  | As of March 31, 2025 |
Description |  | Total Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 120,491 |  |  | $ | 119,989 |  |  | $ | 502 |  |  | $ | — |
Available-for-sale securities |  |  | 251,478 |  |  |  | 23,743 |  |  |  | 227,735 |  |  |  | — |
Investment in equity securities |  |  | 2,100 |  |  |  | — |  |  |  | — |  |  |  | 2,100 |
Total assets |  | $ | 374,069 |  |  | $ | 143,732 |  |  | $ | 228,237 |  |  | $ | 2,100 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment hedge |  |  | 10,500 |  |  |  | — |  |  |  | 10,500 |  |  |  | — |
Foreign exchange contracts |  |  | 340 |  |  |  | — |  |  |  | 340 |  |  |  | — |
Total liabilities |  | $ | 10,840 |  |  | $ | — |  |  | $ | 10,840 |  |  | $ | — |
​ |  | As of September 30, 2024 |
Description |  | Total Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 157,990 |  |  | $ | 157,990 |  |  | $ | — |  |  | $ | — |
Available-for-sale securities |  |  | 198,616 |  |  |  | 37,584 |  |  |  | 161,032 |  |  |  | — |
Convertible debt securities |  |  | 2,000 |  |  |  | — |  |  |  | — |  |  |  | 2,000 |
Foreign exchange contracts |  |  | 9 |  |  |  | — |  |  |  | 9 |  |  |  | — |
Total assets |  | $ | 358,615 |  |  | $ | 195,574 |  |  | $ | 161,041 |  |  | $ | 2,000 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment hedge |  |  | 1,915 |  |  |  | — |  |  |  | 1,915 |  |  |  | — |
Foreign exchange contracts |  |  | 213 |  |  | $ | — |  |  | $ | 213 |  |  | $ | — |
Total liabilities |  | $ | 2,128 |  |  | $ | — |  |  | $ | 2,128 |  |  | $ | — |

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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/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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