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The 401(k) Benefit Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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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. + Details
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Period Type: | duration

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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