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Stock-Based Compensation - Restricted Stock Units and Performance Units Activity (Details) - $ / shares shares in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
RSU
Number of  Shares (In thousands)
Outstanding, beginning (in shares)	236	572	523
Granted (in shares)	306	0	350
Adjustment to September 2017 grant based on achieved attainment level (in shares)	0	0
Vested (in shares)	(141)	(228)	(206)
Forfeited (in shares)	(63)	(108)	(95)
Outstanding, ending (in shares)	338	236	572
Weighted Average Grant Date Fair Value per Share
Outstanding, beginning (in dollars per share)	$ 2.74	$ 2.95	$ 3.71
Granted (in dollars per share)	7.46	0	2.90
Adjustment to September 2017 grant based on achieved attainment level (in dollars per share)	0	0
Vested (in dollars per share)	2.62	3.17	4.51
Forfeited (in dollars per share)	2.96	2.96	3.55
Outstanding, ending (in dollars per share)	$ 7.01	$ 2.74	$ 2.95
PSU
Number of  Shares (In thousands)
Outstanding, beginning (in shares)	133	278	132
Granted (in shares)	314	0	182
Adjustment to September 2017 grant based on achieved attainment level (in shares)	33	23
Vested (in shares)	(100)	(108)	0
Forfeited (in shares)	(39)	(60)	(36)
Outstanding, ending (in shares)	341	133	278
Weighted Average Grant Date Fair Value per Share
Outstanding, beginning (in dollars per share)	$ 2.40	$ 2.69	$ 3.11
Granted (in dollars per share)	7.72	0	2.40
Adjustment to September 2017 grant based on achieved attainment level (in dollars per share)
Vested (in dollars per share)	2.32	3.11	0
Forfeited (in dollars per share)	2.48	2.75	2.74
Outstanding, ending (in dollars per share)	$ 7.30	$ 2.40	$ 2.69

X

- Definition

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

+ References

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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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- Definition

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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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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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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- Definition

The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period.

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

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Change in the weighted average exercise price of options outstanding.

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