Stockholders' Equity - Schedule of As-Converted Class B Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Stockholders' Equity Note [Abstract]
Reduction in equivalent number of as-converted shares of class A common stock (in shares)	0	4
Effective price per share (in dollars per share)	$ 0	$ 219.70
Deposits into the U.S. litigation escrow account	$ 0	$ 850