Equity	9 Months Ended
Equity	Jun. 30, 2023
Equity [Abstract]
Equity	Equity Stock-Based Compensation The Company’s stock-based compensation plans are described in Note 13, “Stock-Based Compensation Plans,” to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the fiscal year ended September 30, 2022. Stock-based compensation consists primarily of restricted stock units (“RSUs”) granted to eligible employees and executives under the Omnibus Incentive Plan. For the three months ended June 30, 2023, the Company recognized a total of $7 million of non-cash stock-based compensation expense which was recorded to additional paid-in capital. For the nine months ended June 30, 2023, the Company recognized a total of $42 million of non-cash stock-based compensation expense, of which $27 million was recorded to additional paid-in capital and $15 million was recorded as a share-based compensation liability. For the nine months ended June 30, 2022, the Company recognized a total of $35 million of non-cash stock-based compensation expense, of which $30 million was recorded to additional paid-in capital and $5 million was recorded as a share-based compensation liability. Share-based compensation liabilities, which are a component of accrued liabilities on the condensed consolidated balance sheets, are recorded for awards under the Omnibus Incentive Plan where a total value is known and settlement will occur in a variable number of shares of Class A Common Stock and RSUs. During the nine months ended June 30, 2023, $5 million of stock-based compensation liability was reclassified to additional paid-in capital, representing the grant date fair value of RSUs granted which were previously classified as a share-based compensation liability as of September 30, 2022. During the three and nine months ended June 30, 2023, the Company approved the issuance of RSUs under the Omnibus Incentive Plan to eligible employees and executives. For the three and nine months ended June 30, 2023, non-cash stock-based compensation associated with these RSUs was $2 million and $12 million, respectively, which was recorded to additional paid-in capital. During the nine months ended June 30, 2023, a separation agreement between the Company and our previous Chief Executive Officer was executed. In connection with the separation agreement, the Company recognized $12 million of non-cash stock-based compensation expense associated with RSUs and common stock as there is no remaining service required for vesting. Such expense was recorded as a share-based compensation liability as of June 30, 2023. During the nine months ended June 30, 2023, the Company issued market-based performance share units (“PSUs”) to our newly appointed Chief Executive Officer whereby the PSU award payout is determined based on the Company’s total shareholder return compared to a designated peer group. Non-cash stock-based compensation associated with these PSUs recognized for the three and nine months ended June 30, 2023 was approximately $1 million and $2 million, respectively, which was recorded to additional paid-in capital. During the nine months ended June 30, 2023, in connection with the Restructuring Plan, the Company recognized $2 million of non-cash stock-based compensation related to the accelerated vesting of certain RSUs. Refer to Note 9 for further discussion. Common Stock During the nine months ended June 30, 2023, in connection with the Senior Management Free Cash Flow Plan (the “Plan”), the Company issued a total of approximately 869,000 shares of Class A Common Stock to settle a portion of a participant’s deferred equity units previously issued under the Plan. During the three and nine months ended June 30, 2023, the Company issued approximately 17,000 and 273,000 shares of Class A Common Stock, respectively, under the Omnibus Incentive Plan.