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Fair Value Information - Additional Information (Detail) - USD ($) | Sep. 30, 2018 | Sep. 30, 2017
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Fair Value Disclosures [Abstract] |  |
Fair value assets transfers from Level 1 to Level 2 | $ 0 | $ 0
Fair value assets transfers from Level 2 to Level 1 | 0 | 0
Fair value liabilities transfers from Level 1 to Level 2 | 0 | 0
Fair value liabilities transfers from Level 2 to Level 1 | $ 0 | $ 0

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