Share-Based Payments - Restricted Stock Awards (Details) - Restricted Stock Awards - $ / shares	6 Months Ended	12 Months Ended
Mar. 31, 2019	Sep. 30, 2018
Restricted stock (in shares)
Unvested at the beginning of the period (in shares)	219,000
Granted (in shares)	287,000
Vested (in shares)	(6,000)
Forfeited (in shares)	(31,000)
Unvested at the end of the period (in shares)	469,000	219,000
Restricted Stock (in dollars per share)
Unvested at the beginning of the period (in dollars per share)	$ 16.98
Granted (in dollars per share)	18.14
Vested (in dollar per share)	18.29
Forfeited (in dollars per share)	17.64
Unvested at the end of the period (in dollars per share)	$ 17.60	$ 16.98
Restricted stock (in years)
Weighted Average Remaining Vesting Term (in Years)	2 years 1 month 6 days	2 years 1 month 6 days

No definition available.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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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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- 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).

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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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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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No definition available.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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No definition available.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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