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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, 2020
Apr. 30, 2019
Apr. 30, 2018
CHANGE IN PLAN ASSETS [Roll Forward]      
Fair Value of Plan Assets, Beginning of Year $ 621,877    
Fair Value, End of Year 659,426 $ 621,877  
WEIGHTED AVERAGE ASSUMPTIONS USED IN DETERMINING ASSETS AND LIABILITIES [Abstract]      
Accumulated Benefit Obligations (853,300) (794,200)  
U.S. [Member]      
CHANGE IN PLAN ASSETS [Roll Forward]      
Fair Value of Plan Assets, Beginning of Year 213,628 204,983  
Actual Return on Plan Assets 11,645 9,705  
Employer Contributions 3,700 14,753  
Employee Contributions 0 0  
Settlements 0 0  
Benefits Paid (15,027) (15,813)  
Foreign Currency Rate Changes 0 0  
Fair Value, End of Year 213,946 213,628 $ 204,983
CHANGE IN PROJECTED BENEFIT OBLIGATION [Roll Forward]      
Benefit Obligation, Beginning of Year (285,197) (279,644)  
Service Cost 0 0 0
Interest Cost (11,247) (11,704) (11,666)
Actuarial Gains (Losses) (37,550) (9,662)  
Benefits Paid 15,027 15,813  
Foreign Currency Rate Changes 0 0  
Settlements and Other 0 0  
Benefit Obligation, End of Year (318,967) (285,197) (279,644)
Underfunded Status, End of Year (105,021) (71,569)  
AMOUNTS RECOGNIZED ON THE STATEMENT OF FINANCIAL POSITION [Abstract]      
Current Pension Liability (4,990) (5,188)  
Noncurrent Pension Liability (100,031) (66,381)  
Net Amount Recognized in Statement of Financial Position (105,021) (71,569)  
AMOUNTS RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE LOSS (BEFORE TAX) CONSIST OF [Abstract]      
Net Actuarial (Losses) (131,569) (94,028)  
Prior Service Cost Gains (Losses) 2,254 2,408  
Total Accumulated Other Comprehensive Loss (129,315) (91,620)  
Change in Accumulated Other Comprehensive Loss $ (37,695) $ (11,546)  
WEIGHTED AVERAGE ASSUMPTIONS USED IN DETERMINING ASSETS AND LIABILITIES [Abstract]      
Discount Rate 3.10% 4.10%  
Rate of Compensation Increase  
Accumulated Benefit Obligations $ (318,967) $ (285,197)  
Non-U.S. [Member]      
CHANGE IN PLAN ASSETS [Roll Forward]      
Fair Value of Plan Assets, Beginning of Year 408,249 419,448  
Actual Return on Plan Assets 48,602 24,891  
Employer Contributions 11,686 11,872  
Employee Contributions 0 0  
Settlements (1,459) 0  
Benefits Paid (9,162) (16,282)  
Foreign Currency Rate Changes (12,436) (31,680)  
Fair Value, End of Year 445,480 408,249 419,448
CHANGE IN PROJECTED BENEFIT OBLIGATION [Roll Forward]      
Benefit Obligation, Beginning of Year (509,015) (540,686)  
Service Cost (1,851) (912) (960)
Interest Cost (12,652) (12,943) (13,876)
Actuarial Gains (Losses) (36,287) (11,013)  
Benefits Paid 9,162 16,282  
Foreign Currency Rate Changes 15,176 41,143  
Settlements and Other 1,164 (886)  
Benefit Obligation, End of Year (534,303) (509,015) $ (540,686)
Underfunded Status, End of Year (88,823) (100,766)  
AMOUNTS RECOGNIZED ON THE STATEMENT OF FINANCIAL POSITION [Abstract]      
Current Pension Liability (885) (816)  
Noncurrent Pension Liability (87,938) (99,950)  
Net Amount Recognized in Statement of Financial Position (88,823) (100,766)  
AMOUNTS RECOGNIZED IN ACCUMULATED OTHER COMPREHENSIVE LOSS (BEFORE TAX) CONSIST OF [Abstract]      
Net Actuarial (Losses) (181,403) (177,157)  
Prior Service Cost Gains (Losses) (1,051) (1,154)  
Total Accumulated Other Comprehensive Loss (182,454) (178,311)  
Change in Accumulated Other Comprehensive Loss $ (4,143) $ 5,446  
WEIGHTED AVERAGE ASSUMPTIONS USED IN DETERMINING ASSETS AND LIABILITIES [Abstract]      
Discount Rate 1.60% 2.40%  
Rate of Compensation Increase 3.00% 3.00%  
Accumulated Benefit Obligations $ (497,489) $ (477,561)