Equity Incentive Plans - Schedule of Restricted Stock Unit Grants for the Period (Parenthetical) (Details)	12 Months Ended
Sep. 30, 2021 Installment shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Granted, shares	90,000
Number of equal annual installments \| Installment	3
Performance-Based Restricted Stock Units \| Maximum \| Catch-Up Provision
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	179,000
Performance-Based Restricted Stock Units \| Maximum Two Times \| Maximum \| Catch-Up Provision
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs	two times
Service-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	1,267,000
Number of equal annual installments \| Installment	3
TSR Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Granted, shares	90,000
TSR Units \| Maximum \| Catch-Up Provision
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	179,000
Percentage of number of RSUs	100.00%
TSR Units \| Maximum Two Times \| Maximum \| Catch-Up Provision
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of RSUs	two times

Number of equal annual installments.

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- Definition

Share based compensation arrangement by share based payment award equity instruments other than options number of RSUs.

+ References

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Share based compensation arrangement by share based payment award equity instruments other than options, percentage of number of RSUs.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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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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