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STOCKHOLDERS' EQUITY - RSU ACTIVITY (Details) - RSUs - $ / shares	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Number of Shares
Beginning balance (in shares)	2,357,021	2,046,169	802,917
Granted (in shares)	1,184,906	1,249,224	1,536,000
Settled (in shares)	(745,197)	(707,174)	(261,621)
Canceled (in shares)	(216,554)	(231,198)	(31,127)
Ending balance (in shares)	2,580,176	2,357,021	2,046,169
Weighted- Average Fair Value Per Share
Beginning balance (in dollars per share)	$ 5.65	$ 4.90	$ 4.49
Granted (in dollars per share)	8.54	6.61	4.82
Settled (in dollars per share)	5.26	4.81	4.77
Cancelled (in dollars per share)	7.39	4.93	4.19
Ending balance (in dollars per share)	$ 6.92	$ 5.65	$ 4.90

X

- 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 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 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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Number of non-option equity instruments exercised by participants.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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Net number of non-option equity instruments granted to participants.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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