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Stock-Based Compensation Plans - Schedule of Unvested RSUs (Details) - $ / shares	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Aggregate Intrinsic Value
Granted (in dollars per share)		$ 23.82	$ 3.13
Restricted Stock Units (RSUs)
Number of Share Units
Unvested units beginning balance (in shares)	0
Granted (in shares)	1,604,922
Vested (in shares)	(217)
Forfeited/canceled (in shares)	(69,338)
Unvested units ending balance (in shares)	1,535,367	0
Weighted-Average Grant Date Fair Value
Unvested and outstanding beginning balance (in dollars per share)	$ 0
Granted (in dollars per share)	32.23
Vested (in dollars per share)	36.87
Forfeited/canceled (in dollars per share)	30.83
Unvested and outstanding ending balance (in dollars per share)	32.29	$ 0
Aggregate Intrinsic Value
Unvested units beginning balance (in dollars per share)	0
Granted (in dollars per share)
Vested (in dollars per share)
Forfeited/canceled\ (in dollars per share)
Unvested units ending balance (in dollars per share)	$ 67,879,000	$ 0

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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Per share or unit weighted-average intrinsic value of award forfeited under share-based payment arrangement. Excludes share and unit options.

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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