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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Jul. 31, 2020
Accumulated Other Comprehensive Loss [Abstract]  
Changes in Accumulated Other Comprehensive Loss by Component, Net of Tax
Changes in Accumulated Other Comprehensive Loss by component, net of tax, for the three months ended July 31, 2020 and 2019 were as follows:

  
Foreign
Currency Translation
    
Unamortized
Retirement Costs
    
Interest
Rate Swaps
    
Total
  
Balance at April 30, 2020
  
$
(340,703
)
  
$
(227,920
)
  
$
(6,874
)
  
$
(575,497
)
Other comprehensive income (loss) before reclassifications
    
46,853
      
(7,190
)
    
(669
)
    
38,994
  
Amounts reclassified from Accumulated Other Comprehensive Loss
    
—
      
1,525
      
860
      
2,385
  
Total other comprehensive (loss) income
    
46,853
      
(5,665
)
    
191
      
41,379
  
Balance at July 31, 2020
  
$
(293,850
)
  
$
(233,585
)
  
$
(6,683
)
  
$
(534,118
)
                                 
Balance at April 30, 2019
  
$
(312,107
)
  
$
(196,057
)
  
$
(574
)
  
$
(508,738
)
Other comprehensive (loss) income before reclassifications
    
(35,539
)
    
7,130
      
328
      
(28,081
)
Amounts reclassified from Accumulated Other Comprehensive Loss
    
—
      
1,038
      
(243
)
    
795
  
Total other comprehensive (loss) income
    
(35,539
)
    
8,168
      
85
      
(27,286
)
Balance at July 31, 2019
  
$
(347,646
)
  
$
(187,889
)
  
$
(489
)
  
$
(536,024
)