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Note 4 - Business Combinations (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Feb. 02, 2023 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
Payments to Acquire Businesses, Net of Cash Acquired |  | $ (0) | $ (0) | $ 386,508
Goodwill |  | $ 702,395 | $ 691,409 | $ 675,361
Ziath, Ltd. [Member] |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 16,000 |  |  |
Goodwill | 12,000 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities | 1,100 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | 300 |  |  |
Business Acquisition, Goodwill, Expected Tax Deductible Amount | 0 |  |  |
Ziath, Ltd. [Member] | Developed Technology Rights [Member] |  |  |  |
Payments to Acquire Businesses, Net of Cash Acquired | $ 4,100 |  |  |
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) | 10 years |  |  |
Ziath, Ltd. [Member] | Customer Relationships [Member] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 600 |  |  |
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) | 13 years |  |  |
Ziath, Ltd. [Member] | Trademarks [Member] |  |  |  |
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year) | 13 years |  |  |

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