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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, 2021	Apr. 30, 2020
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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Namespace Prefix:	us-gaap_
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