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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, 2021
Apr. 30, 2020
Apr. 30, 2019
CHANGE IN PLAN ASSETS [Roll Forward]      
Fair value of plan assets, beginning of year $ 659,426    
Fair value, end of year 761,015 $ 659,426  
US [Member]      
CHANGE IN PLAN ASSETS [Roll Forward]      
Fair value of plan assets, beginning of year 213,946 213,628  
Actual return on plan assets 34,560 11,645  
Employer contributions 5,599 3,700  
Employee contributions 0 0  
Settlements 0 0  
Benefits paid (16,976) (15,027)  
Foreign currency rate changes 0 0  
Fair value, end of year 237,129 213,946 $ 213,628
CHANGE IN PROJECTED BENEFIT OBLIGATION [Roll Forward]      
Benefit obligation, beginning of year (318,967) (285,197)  
Service cost 0 0 0
Interest cost (9,504) (11,247) (11,704)
Actuarial gains (losses) 8,863 (37,550)  
Benefits paid 16,976 15,027  
Foreign currency rate changes 0 0  
Settlements and other 0 0  
Benefit obligation, end of year (302,632) (318,967) (285,197)
Underfunded status, end of year (65,503) (105,021)  
AMOUNTS RECOGNIZED ON THE STATEMENT OF FINANCIAL POSITION [Abstract]      
Noncurrent assets 0 0  
Current pension liability (3,576) (4,990)  
Noncurrent pension liability (61,927) (100,031)  
Net amount recognized in statement of financial position (65,503) (105,021)  
AMOUNTS RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE LOSS (BEFORE TAX) CONSIST OF [Abstract]      
Net actuarial (losses) (96,613) (131,569)  
Prior service cost gains (losses) 2,100 2,254  
Total accumulated other comprehensive loss (94,513) (129,315)  
Change in accumulated other comprehensive loss 34,802 (37,695)  
INFORMATION FOR PENSION PLANS WITH AN ACCUMULATED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS [Abstract]      
Accumulated benefit obligation 302,632 318,967  
Fair value of plan assets 237,129 213,946  
INFORMATION FOR PENSION PLANS WITH A PROJECTED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS [Abstract]      
Projected benefit obligation 302,632 318,967  
Fair value of plan assets $ 237,129 $ 213,946  
WEIGHTED AVERAGE ASSUMPTIONS USED IN DETERMINING ASSETS AND LIABILITIES [Abstract]      
Discount rate 3.20% 3.10%  
Rate of compensation increase  
Accumulated benefit obligations $ (302,632) $ (318,967)  
Non-US [Member]      
CHANGE IN PLAN ASSETS [Roll Forward]      
Fair value of plan assets, beginning of year 445,480 408,249  
Actual return on plan assets 27,971 48,602  
Employer contributions 12,203 11,686  
Employee contributions 0 0  
Settlements 0 (1,459)  
Benefits paid (11,921) (9,162)  
Foreign currency rate changes 50,153 (12,436)  
Fair value, end of year 523,886 445,480 408,249
CHANGE IN PROJECTED BENEFIT OBLIGATION [Roll Forward]      
Benefit obligation, beginning of year (534,303) (509,015)  
Service cost (1,396) (1,851) (912)
Interest cost (8,901) (12,652) (12,943)
Actuarial gains (losses) (17,739) (36,287)  
Benefits paid 11,921 9,162  
Foreign currency rate changes (59,046) 15,176  
Settlements and other (150) 1,164  
Benefit obligation, end of year (609,614) (534,303) $ (509,015)
Underfunded status, end of year (85,728) (88,823)  
AMOUNTS RECOGNIZED ON THE STATEMENT OF FINANCIAL POSITION [Abstract]      
Noncurrent assets 6 0  
Current pension liability (1,414) (885)  
Noncurrent pension liability (84,320) (87,938)  
Net amount recognized in statement of financial position (85,728) (88,823)  
AMOUNTS RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE LOSS (BEFORE TAX) CONSIST OF [Abstract]      
Net actuarial (losses) (213,958) (181,403)  
Prior service cost gains (losses) (1,299) (1,051)  
Total accumulated other comprehensive loss (215,257) (182,454)  
Change in accumulated other comprehensive loss (32,803) (4,143)  
INFORMATION FOR PENSION PLANS WITH AN ACCUMULATED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS [Abstract]      
Accumulated benefit obligation 566,998 497,489  
Fair value of plan assets 513,279 445,480  
INFORMATION FOR PENSION PLANS WITH A PROJECTED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS [Abstract]      
Projected benefit obligation 599,011 534,303  
Fair value of plan assets $ 513,279 $ 445,480  
WEIGHTED AVERAGE ASSUMPTIONS USED IN DETERMINING ASSETS AND LIABILITIES [Abstract]      
Discount rate 1.90% 1.60%  
Rate of compensation increase 3.00% 3.00%  
Accumulated benefit obligations $ (577,600) $ (497,489)