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Defined Benefit Pension Plans - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2024
Jan. 31, 2024
Apr. 30, 2024
Retirement Benefits [Abstract]      
Remaining pension plan liabilities     $ 17,800,000
Employer contributions $ 0 $ 0 $ 287,000
Assumed as expected long-term rate of return (as a percent)   7.75%