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Balance Sheet Details - Goodwill (Details) - USD ($) $ in Thousands	12 Months Ended
	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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