Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Accounts receivable, allowances	$ 27	$ 26
Class A Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	146,906,000	142,559,000
Common stock outstanding (in shares)	146,906,000	142,559,000
Class B Common Stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	375,380,000	375,380,000
Common stock outstanding (in shares)	375,380,000	375,380,000