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Retirement Plans, Changes in and Status of Defined Benefit Plans' Assets and Benefit Obligations (Details) - USD ($)
$ in Thousands
 12 Months Ended
Apr. 30, 2022
Apr. 30, 2021
Apr. 30, 2020
CHANGE IN PLAN ASSETS [Roll Forward]      
Fair value of plan assets, beginning of year $ 761,015    
Fair value, end of year 646,714 $ 761,015  
US [Member]      
CHANGE IN PLAN ASSETS [Roll Forward]      
Fair value of plan assets, beginning of year 237,129 213,946  
Actual return on plan assets (21,257) 34,560  
Employer contributions 3,812 5,599  
Employee contributions 0 0  
Settlements 0 0  
Benefits paid (15,229) (16,976)  
Foreign currency rate changes 0 0  
Fair value, end of year 204,455 237,129 $ 213,946
CHANGE IN PROJECTED BENEFIT OBLIGATION [Roll Forward]      
Benefit obligation, beginning of year (302,632) (318,967)  
Service cost 0 0 0
Interest cost (9,451) (9,504) (11,247)
Actuarial gains (losses) 47,284 8,863  
Benefits paid 15,229 16,976  
Foreign currency rate changes 0 0  
Settlements and other 0 0  
Benefit obligation, end of year (249,570) (302,632) (318,967)
Underfunded status, end of year (45,115) (65,503)  
AMOUNTS RECOGNIZED ON THE STATEMENT OF FINANCIAL POSITION [Abstract]      
Noncurrent assets 0 0  
Current pension liability (3,545) (3,576)  
Noncurrent pension liability (41,570) (61,927)  
Net amount recognized in statement of financial position (45,115) (65,503)  
AMOUNTS RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE LOSS (BEFORE TAX) CONSIST OF [Abstract]      
Net actuarial (losses) gains (80,114) (96,613)  
Prior service cost gains (losses) 1,946 2,100  
Total accumulated other comprehensive loss (78,168) (94,513)  
Change in accumulated other comprehensive loss 16,345 34,802  
INFORMATION FOR PENSION PLANS WITH AN ACCUMULATED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS [Abstract]      
Accumulated benefit obligation 249,570 302,632  
Fair value of plan assets 204,455 237,129  
INFORMATION FOR PENSION PLANS WITH A PROJECTED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS [Abstract]      
Projected benefit obligation 249,570 302,632  
Fair value of plan assets $ 204,455 $ 237,129  
WEIGHTED AVERAGE ASSUMPTIONS USED IN DETERMINING ASSETS AND LIABILITIES [Abstract]      
Discount rate 4.60% 3.20%  
Accumulated benefit obligations $ (249,570) $ (302,632)  
Non-US [Member]      
CHANGE IN PLAN ASSETS [Roll Forward]      
Fair value of plan assets, beginning of year 523,886 445,480  
Actual return on plan assets (37,543) 27,971  
Employer contributions 12,595 12,203  
Employee contributions 0 0  
Settlements 0 0  
Benefits paid (10,703) (11,921)  
Foreign currency rate changes (45,976) 50,153  
Fair value, end of year 442,259 523,886 445,480
CHANGE IN PROJECTED BENEFIT OBLIGATION [Roll Forward]      
Benefit obligation, beginning of year (609,614) (534,303)  
Service cost (1,196) (1,396) (1,851)
Interest cost (11,148) (8,901) (12,652)
Actuarial gains (losses) 84,746 (17,739)  
Benefits paid 10,703 11,921  
Foreign currency rate changes 51,660 (59,046)  
Settlements and other 47 (150)  
Benefit obligation, end of year (474,802) (609,614) $ (534,303)
Underfunded status, end of year (32,543) (85,728)  
AMOUNTS RECOGNIZED ON THE STATEMENT OF FINANCIAL POSITION [Abstract]      
Noncurrent assets 5,855 6  
Current pension liability (1,346) (1,414)  
Noncurrent pension liability (37,052) (84,320)  
Net amount recognized in statement of financial position (32,543) (85,728)  
AMOUNTS RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE LOSS (BEFORE TAX) CONSIST OF [Abstract]      
Net actuarial (losses) gains (171,274) (213,958)  
Prior service cost gains (losses) (1,165) (1,299)  
Total accumulated other comprehensive loss (172,439) (215,257)  
Change in accumulated other comprehensive loss 42,818 (32,803)  
INFORMATION FOR PENSION PLANS WITH AN ACCUMULATED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS [Abstract]      
Accumulated benefit obligation 37,801 566,998  
Fair value of plan assets 475 513,279  
INFORMATION FOR PENSION PLANS WITH A PROJECTED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS [Abstract]      
Projected benefit obligation 38,871 599,011  
Fair value of plan assets $ 475 $ 513,279  
WEIGHTED AVERAGE ASSUMPTIONS USED IN DETERMINING ASSETS AND LIABILITIES [Abstract]      
Discount rate 3.00% 1.90%  
Rate of compensation increase 3.10% 3.00%  
Accumulated benefit obligations $ (450,037) $ (577,600)