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Equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash compensation expense	$ 49	$ 39	$ 45
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share)	$ 39.81	$ 44.38	$ 32.23
Awards vested in period, intrinsic value	$ 1	$ 18	$ 0
Unrecognized compensation costs	$ 50
Total compensation of unvested awards expected to be recognized, weighted average period	2 years 4 months 24 days
Non-cash stock-based compensation expense	$ 13
Restricted Stock Units (RSUs) | Restructuring Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock-based compensation expense	2
Market Based Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock-based compensation expense	$ 4
Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under Omnibus Incentive Plan (in shares)	276,516	463,826	36,206
Class A Common Stock | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under Omnibus Incentive Plan (in shares)	277,000	187,000	36,000
Vesting of restricted stock units, net of shares withheld for employee taxes (in shares)	276,565	277,000
Shares issued under the Plan (in shares)	869,008		4,321,000
Exchange of Class B shares for Class A shares (in shares)		14,320,547	19,234,000
Conversion of Class B shares to Class A shares (in shares)		14,321,000	10,245,000
Common Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock redeemed during period (in shares)		510,165
Conversion of Class B shares to Class A shares (in shares)		13,810,382
Common Class B | Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Exchange of Class B shares for Class A shares (in shares)			19,234,000
Conversion of Class B shares to Class A shares (in shares)		14,321,000	10,245,000
Omnibus Incentive Plan | Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares available for grant (in shares)	31,169,099
Share awards vesting period	10 years
Shares held in employee stock option plan, allocated (in shares)	805,035
Common stock available for issuance (in shares)	30,364,190
Omnibus Incentive Plan | Class A Common Stock | IPO
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized (in shares)	1,000,000

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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