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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Apr. 30, 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 years ended April 30, 2020, 2019, and 2018 were as follows:

  
Foreign
Currency
Translation
    
Unamortized
Retirement
Costs
    
Interest
Rate Swaps
    
Total
  
Balance at April 30, 2017
  
$
(319,212
)
  
$
(190,502
)
  
$
2,427
    
$
(507,287
)
Other comprehensive income (loss) before reclassifications
    
67,639
      
(4,979
)
    
1,739
      
64,399
  
Amounts reclassified from Accumulated Other Comprehensive Loss
    
—
      
4,455
      
(1,147
)
    
3,308
  
Total other comprehensive income (loss)
    
67,639
      
(524
)
    
592
      
67,707
  
Balance at April 30, 2018
  
$
(251,573
)
  
$
(191,026
)
  
$
3,019
    
$
(439,580
)
Other comprehensive (loss) income before reclassifications
    
(60,534
)
    
(9,422
)
    
1,121
      
(68,835
)
Amounts reclassified from Accumulated Other Comprehensive Loss
    
—
      
4,391
      
(4,714
)
    
(323
)
Total other comprehensive (loss) income
    
(60,534
)
    
(5,031
)
    
(3,593
)
    
(69,158
)
Balance at April 30, 2019
  
$
(312,107
)
  
$
(196,057
)
  
$
(574
)
  
$
(508,738
)
Other comprehensive (loss) before reclassifications
    
(28,596
)
    
(36,965
)
    
(5,988
)
    
(71,549
)
Amounts reclassified from Accumulated Other Comprehensive Loss
    
—
      
5,102
      
(312
)
    
4,790
  
Total other comprehensive loss
    
(28,596
)
    
(31,863
)
    
(6,300
)
    
(66,759
)
Balance at April 30, 2020
  
$
(340,703
)
  
$
(227,920
)
  
$
(6,874
)
  
$
(575,497
)