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Restructuring Expenses - Additional Information (Details) | 12 Months Ended
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Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) position
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges | $ 0 | $ 0 | $ 4,500,000
Number of positions reduced | position |  |  | 79
Facilities charges |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  |  | $ 1,700,000
Employee separation |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Restructuring charges |  |  | $ 2,800,000

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