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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 + Details
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- Definition Per share or unit weighted-average intrinsic value of award forfeited under share-based payment arrangement. Excludes share and unit options. + 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 + Details
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- Definition 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). + 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)(01) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options. + 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)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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- Definition 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. + 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)(ii) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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