Debt - Trade Receivables Facility (Details) - Line of Credit - Trade Receivables Facility - Secured Debt - USD ($)		12 Months Ended
Apr. 27, 2021	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Principal amount of line of credit	$ 175,000,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	33.00%
Remaining borrowing capacity		$ 116,000,000
Weighted-average interest rate		1.00%	1.40%
Repayments on borrowings		$ 29,000,000
Financing Subsidiary
Debt Instrument [Line Items]
Accounts receivable pledged as collateral		$ 301,000,000	$ 267,000,000

Amount of assets pledged to secure a debt instrument.

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- Definition

The average effective interest rate during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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