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Fair Value Information - Additional Information (Detail) - USD ($) | Sep. 30, 2017 | Sep. 30, 2016
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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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- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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