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Accumulated Other Comprehensive Income (Loss) - Schedule of Before Tax Income (Loss) Related Income Tax effect and Accumulated Balances (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2024
Apr. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance $ (3,442) $ (3,742)
Foreign currency translation adjustment (598) (290)
Change in unrecognized actuarial loss on pension obligations 509 590
Settlement loss included in net income 4,019 0
Income taxes on postretirement benefit plans 3,870 0
Ending Balance (3,382) (3,442)
Foreign Currency Translation Adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (2,833) (2,543)
Foreign currency translation adjustment (549) (290)
Ending Balance (3,382) (2,833)
Minimum Pension Liability Adjustment    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Beginning Balance (609) (1,199)
Foreign currency translation adjustment (49)  
Change in unrecognized actuarial loss on pension obligations 509 590
Settlement loss included in net income 4,019  
Income taxes on postretirement benefit plans (3,870)  
Ending Balance $ 0 $ (609)