Stock Compensation - Restricted Stock Award Activity (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Restricted Stock and Phantom Share-Based Awards
Weighted Average Grant date Fair Value
Total grant date fair value of shares vested	$ 11.8	$ 2.3	$ 3.8
Restricted stock
Shares
Outstanding, beginning balance (shares)	3,555,725
Granted (shares)	1,152,653
Vested and released (shares)	(1,314,905)
Forfeited (Shares)	(368,319)
Outstanding, ending balance (shares)	3,025,154	3,555,725
Weighted Average Grant date Fair Value
Outstanding, beginning balance (usd per share)	$ 7.76
Granted (usd per share)	9.29	$ 9.75	$ 9.57
Vested and released (usd per share)	5.91
Forfeited (usd per share)	6.65
Outstanding, ending balance (usd per share)	$ 9.29	7.76
Number of shares withheld to satisfy related federal income tax withholding	360,489
Weighted average grant-date fair value per share granted (usd per share)	$ 9.29	$ 9.75	$ 9.57

Stock issued during period shares restricted stock award, weighted average grant date fair value.

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- Definition

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

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- Definition

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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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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The weighted average fair value at grant date for nonvested equity-based awards issued 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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- 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.

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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