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Stock-Based Compensation Plans - Summary of Company's Share Awards (Details) - $ / shares	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2020
Equity Units Weighted-Average Intrinsic Value
Granted (in dollars per share)			$ 23.82
Deferred Equity Units
Equity Units
Unvested units beginning balance (in shares)	0	549,454
Granted (in shares)	0	0
Vested (in shares)	0	(549,454)
Forfeited (in shares)	0	0
Unvested units ending balance (in shares)	0	0	549,454
Equity Units Weighted-Average Intrinsic Value
Unvested units beginning balance (in dollars per share)	$ 0	$ 27.01
Granted (in dollars per share)	0	0
Vested (in dollars per share)	0	44.21
Forfeited (in dollars per share)	0	0
Unvested units ending balance (in dollars per share)	0	0	$ 27.01
Equity Units Weighted-Average Grant-Date Intrinsic Value
Unvested units beginning balance (in usd per share)	0	23.82
Granted (in usd per share)	0	0
Vested (in usd per share)	0	41.02
Forfeited (in usd per share)	0	0
Unvested units ending balance (in usd per share)	$ 0	$ 0	$ 23.82
Matching Equity Units
Equity Units
Unvested units beginning balance (in shares)	2,008,283	4,311,861
Granted (in shares)	0	0
Vested (in shares)	(1,458,829)	(2,303,578)
Forfeited (in shares)	0	0
Unvested units ending balance (in shares)	549,454	2,008,283	4,311,861
Equity Units Weighted-Average Intrinsic Value
Unvested units beginning balance (in dollars per share)	$ 41.02	$ 23.82
Granted (in dollars per share)	0	0
Vested (in dollars per share)	20.02	41.02
Forfeited (in dollars per share)	0	0
Unvested units ending balance (in dollars per share)	20.02	41.02	$ 23.82
Equity Units Weighted-Average Grant-Date Intrinsic Value
Unvested units beginning balance (in usd per share)	0	0
Granted (in usd per share)	0	0
Vested (in usd per share)	0	0
Forfeited (in usd per share)	0	0
Unvested units ending balance (in usd per share)	$ 0	$ 0	$ 0

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(03)
-URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901

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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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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The grant-date intrinsic value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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