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Nature of Business and Summary of Significant Accounting Policies - New Accounting Pronouncements (Detail) - USD ($) $ in Millions | 12 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017
Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member] | Pro Forma [Member] |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ (32.3) | $ 2.8

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