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Balance Sheet Details - Goodwill (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Balance Sheet Details [Abstract] |  |
Goodwill, Beginning Balance | $ 2,312,362 | $ 2,288,678
Goodwill, Acquired During Period | 131,520 | 23,684
Goodwill, Ending Balance | $ 2,443,882 | $ 2,312,362

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