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Fair Value of Financial Instruments - Summary of Fair Value Hierarchy for Financial Assets and Liabilities Measured Recurring Basis, Phantom (Detail) - CompensationPlan | Jan. 31, 2020 | Apr. 30, 2019
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Fair Value Disclosures [Abstract] |  |
Number of non-qualified compensation plans maintained | 2 | 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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