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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Jul. 31, 2022
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, 2022 and 2021 were as follows:

  
Foreign
Currency Translation
    
Unamortized
Retirement Costs
    
Interest
Rate Swaps
    
Total
  
Balance at April 30, 2022
  
$
(329,566
)
  
$
(182,226
)
  
$
3,646
    
$
(508,146
)
Other comprehensive (loss) income before reclassifications
    
(19,780
)
    
3,979
      
(737
)
    
(16,538
)
Amounts reclassified from Accumulated other comprehensive loss
    
—
      
1,102
      
293
      
1,395
  
Total other comprehensive (loss) income
    
(19,780
)
    
5,081
      
(444
)
    
(15,143
)
Balance at July 31, 2022
  
$
(349,346
)
  
$
(177,145
)
  
$
3,202
    
$
(523,289
)
                                 
Balance at April 30, 2021
  
$
(257,941
)
  
$
(228,146
)
  
$
(4,703
)
  
$
(490,790
)
Other comprehensive (loss) income before reclassifications
    
(5,937
)
    
142
      
(293
)
    
(6,088
)
Amounts reclassified from Accumulated other comprehensive loss
    
—
      
1,447
      
831
      
2,278
  
Total other comprehensive (loss) income
    
(5,937
)
    
1,589
      
538
      
(3,810
)
Balance at July 31, 2021
  
$
(263,878
)
  
$
(226,557
)
  
$
(4,165
)
  
$
(494,600
)