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Summary of Significant Accounting Policies - Summary of Fair Value Hierarchy for Financial Assets and Liabilities Measured Recurring and Nonrecurring Basis (Parenthetical) (Detail) | Apr. 30, 2018 CompensationPlan
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Fair Value Disclosures [Abstract] |
Number of non-qualified compensation plans maintained | 2

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- Definition Number of nonqualified compensation plans. + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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