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Note 12 - Fair Value Measurements | 9 Months Ended
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Jun. 30, 2025
Notes to Financial Statements |
Fair Value Disclosures [Text Block] | 12. Fair Value Measurements See Note 2, Summary of Significant Accounting Policies in the notes to the audited consolidated financial statements included in the section titled “Financial Statements and Supplementary Data” in Part II, Item 8 of the 2024 Annual Report on Form 10-K for information on the fair value hierarchy and the level of inputs used by the Company in determining fair value. Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis The following tables summarize assets and liabilities measured and recorded at fair value on a recurring basis in the Condensed Consolidated Balance Sheets as of June 30, 2025 and September 30, 2024 (in thousands):
​ |  | As of June 30, 2025 |
Description |  | Total Fair Value |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 141,537 |  |  | $ | 141,035 |  |  | $ | 502 |  |  | $ | — |
Available-for-sale securities |  |  | 270,985 |  |  |  | 9,447 |  |  |  | 261,538 |  |  |  | — |
Investment in equity securities |  |  | 2,100 |  |  |  | — |  |  |  | — |  |  |  | 2,100 |
Foreign exchange contracts |  |  | 142 |  |  |  | — |  |  |  | 142 |  |  |  | — |
Total assets |  | $ | 414,764 |  |  | $ | 150,482 |  |  | $ | 262,182 |  |  | $ | 2,100 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net investment hedge |  |  | 34,656 |  |  |  | — |  |  |  | 34,656 |  |  |  | — |
Total liabilities |  | $ | 34,656 |  |  | $ | — |  |  | $ | 34,656 |  |  | $ | — |
​ |  | 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 |  |  | $ | — |
Cash Equivalents The Company considers all highly liquid interest-earning investments with a maturity of three months or less at the date of purchase to be cash equivalents. Cash equivalents primarily consist of money market funds and U.S. government backed securities with a maturity of three months or less. They are classified as Level 1 because they are valued using quoted market prices in active markets. The fair values of these investments approximate their carrying values. Investments classified as Level 2 consist of debt securities valued using matrix pricing benchmarking because they are not actively traded and bank certificates of deposit with a maturity of three months or less. Matrix pricing is a mathematical technique used to value securities by relying on the securities’ relationship to other benchmark quoted prices. Available-For-Sale Securities Available-for-sale securities primarily consist of highly rated corporate debt securities, and U.S. government backed securities, which are classified as Level 1. Investments classified as Level 2 consist of debt securities that are valued using matrix pricing and benchmarking because they are not actively traded, and bank certificates of deposit. Convertible Debt Securities and Investment in Equity Securities In the third quarter of fiscal year 2024, the Company purchased $2.0 million principal amount of convertible notes issued by a private company. The Company accounted for the investment in these convertible notes at fair value with changes in fair value recognized in the Condensed Consolidated Statement of Operations. As of the conversion of these notes into preferred stock of the private company described below, the fair value of the convertible notes was $2.1 million. During the first quarter of fiscal year 2025, the Company converted the convertible notes into 420,000 shares of preferred stock of the private company. The conversion did not result in the recognition of additional gain or loss on the convertible notes. The shares of preferred stock are equity securities and within the scope of ASC 321, Investments - Equity Securities. The Company elected the measurement alternative for its investment in the shares of preferred stock because the shares do not have a readily determinable fair value. As of June 30, 2025, the carrying value of the investment in the shares of preferred stock was $2.1 million and is included in “Other assets” on the Condensed Consolidated Balance Sheets. The fair value determination is classified as Level 3 based on unobservable inputs which were based on the best information available in the circumstance, including transaction pricing, recent acquisition, and market participant assumptions. The unobservable inputs used in the determination of the fair value of assets classified as Level 3 have an inherent measurement uncertainty that if changed could result in higher or lower fair value measurements of the assets as of the reporting date. Foreign Exchange Contracts & Net Investment Hedge The Company’s foreign exchange contract assets and liabilities, and its net investment hedge assets are measured and reported at fair value using the market method valuation technique. The inputs to this technique utilize current foreign currency exchange forward market rates published by third-party leading financial news and data providers. These are observable data that represent the rates that the financial institution uses for contracts entered into at that date; however, they are not based on actual transactions, so they are classified as Level 2. Financial Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis During the three and nine months ended June 30, 2025 and 2024, the Company did not record any material other-than-temporary impairments on financial assets required to be measured at fair value on a nonrecurring basis.

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- Definition The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 107 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-107 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2E -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2E Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-6A Reference 11: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 12: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 13: http://www.xbrl.org/2003/role/disclosureRef -Topic 940 -SubTopic 820 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478119/940-820-50-1 + Details
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