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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Jul. 31, 2019
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, 2019 and 2018 were as follows:


  
Foreign
Currency Translation
    
Unamortized
Retirement Costs
    
Interest
Rate Swaps
    
Total
  
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
)
                                 
Balance at April 30, 2018
  
$
(251,573
)
  
$
(191,026
)
  
$
3,019
    
$
(439,580
)
Other comprehensive income (loss) before reclassifications
    
(40,325
)
    
7,720
      
70
      
(32,535
)
Amounts reclassified from accumulated other comprehensive loss
    
—
      
1,091
      
(722
)
    
369
  
Total other comprehensive income (loss)
    
(40,325
)
    
8,811
      
(652
)
    
(32,166
)
Balance at July 31, 2018
  
$
(291,898
)
  
$
(182,215
)
  
$
2,367
    
$
(471,746
)