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Defined Benefit Pension Plans - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Oct. 31, 2021	Oct. 31, 2020
Retirement Benefits [Abstract]
Employer contributions	$ 0	$ 0	$ 0	$ 0
Assumed as expected long-term rate of return (as a percent)			7.75%	7.75%

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- References

No definition available.

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

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-Publisher FASB
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-SubTopic 20
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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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