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Defined Benefit Pension Plans - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2019 | Oct. 31, 2019 | Oct. 31, 2018
Retirement Benefits [Abstract] |  |  |
Employer contributions | $ 0 | $ 0 | $ 1,000,000
Employer contributions paid during the remainder of fiscal year | $ 0 | $ 0 |
Assumed as expected long-term rate of return |  | 7.75% | 7.75%

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