Equity Incentive Plan - Schedule of Restricted Stock Unit Grants for the Period (Parenthetical) (Details) shares in Thousands	12 Months Ended
Sep. 30, 2020 Installment shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year 3 months 18 days
TSR Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	101
Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	501
Vesting period	3 years
Number of equal annual installments \| Installment	3
Service-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	2,168
Number of equal annual installments \| Installment	3
Catch-Up Provision \| TSR Units \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	202
Catch-Up Provision \| TSR Units \| Maximum \| Maximum Two Times
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	202
Number of RSUs	two times
Catch-Up Provision \| TSR Units \| Maximum \| Maximum 110%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted, shares	440
Percentage of number of RSUs	110.00%
November 15 2020, 2021 and 2022 \| Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Eligible to vest, shares	101
November 15 2021, 2022 and 2023 \| Performance-Based Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Eligible to vest, shares	400

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

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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
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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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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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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