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Consolidation, Noncontrolling Interests and Basis of Presentation - Additional Information (Detail) | Aug. 31, 2018 | Aug. 31, 2017
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Accounting Policies [Abstract] |  |
Percentage of controlled subsidiary's earnings | 100.00% | 100.00%

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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