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Defined Benefit Pension Plans - Additional Information (Detail) - USD ($)	3 Months Ended
	Jul. 31, 2018	Jul. 31, 2017
Retirement Benefits [Abstract]
Employer contributions	$ 1,000,000	$ 0
Company expected contributions remainder of fiscal year	$ 0
Assumed as expected long-term rate of return	7.75%	7.75%

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- References

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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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- Definition

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

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Amount of benefits for defined benefit plan expected to be paid in remainder of fiscal year.

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