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The 401(k) Benefit Plan (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Defined Contribution Plan [Abstract]
Amount contributed and recorded expense under the 401(k) Benefit Plan	$ 1.6	$ 1.4	$ 2.1

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- References

No definition available.

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- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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