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Acquisitions (Assets Acquired and Liabilities Assumed) (Details) - USD ($) $ in Thousands | Aug. 18, 2025 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Cash | $ 148,487 |  |  |
Identifiable intangible assets |  | $ (57,926) | $ (25,533) |
Goodwill |  | 392,872 | 342,774 | $ 341,593
Operating lease right-of-use assets |  | 8,430 | 10,207 |
Total reported lease liability |  | $ 12,032 | $ 14,201 |
Jolt |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Tangible Assets Acquired (Liabilities) Assumed | (4,694) |  |  |
Deferred Tax Assets, Operating Loss Carryforwards | 13,798 |  |  |
Identifiable intangible assets | (30,326) |  |  |
Goodwill | 50,209 |  |  |
Total assets acquired and liabilities assumed | $ 148,487 |  |  |
Weighted average useful life identifiable intangibles | 15 years 9 months 18 days |  |  |
Customer Relationships | Jolt |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 99,000 |  |  |
Weighted average useful life identifiable intangibles | 17 years |  |  |
Trademarks | Jolt |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 4,500 |  |  |
Weighted average useful life identifiable intangibles | 7 years 6 months |  |  |
Purchased and Core Technology | Jolt |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill | $ 16,000 |  |  |
Weighted average useful life identifiable intangibles | 11 years |  |  |

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