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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Jan. 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 and nine months ended January 31, 2022 and 2021 were as follows:

  
Foreign
Currency
Translation
    
Unamortized
Retirement
Costs
    
Interest
Rate Swaps
    
Total
  
                         
Balance at October 31, 2021
  
$
(273,361
)
  
$
(222,492
)
  
$
(2,356
)
  
$
(498,209
)
Other comprehensive (loss) income before reclassifications
    
(15,918
)
    
3,275
      
1,174
      
(11,469
)
Amounts reclassified from accumulated other comprehensive loss
    
—
      
1,413
      
826
      
2,239
  
Total other comprehensive (loss) income
    
(15,918
)
    
4,688
      
2,000
      
(9,230
)
Balance at January 31, 2022
  
$
(289,279
)
  
$
(217,804
)
  
$
(356
)
  
$
(507,439
)
                                 
Balance at April 30, 2021
  
$
(257,941
)
  
$
(228,146
)
  
$
(4,703
)
  
$
(490,790
)
Other comprehensive (loss) income before reclassifications
    
(31,338
)
    
6,056
      
1,859
      
(23,423
)
Amounts reclassified from accumulated other comprehensive loss
    
—
      
4,286
      
2,488
      
6,774
  
Total other comprehensive (loss) income
    
(31,338
)
    
10,342
      
4,347
      
(16,649
)
Balance at January 31, 2022
  
$
(289,279
)
  
$
(217,804
)
  
$
(356
)
  
$
(507,439
)

 
Foreign
Currency
Translation
    
Unamortized
Retirement
Costs
    
Interest
Rate Swaps
    
Total
  
                         
Balance at October 31, 2020
  
$
(305,476
)
  
$
(230,182
)
  
$
(5,984
)
  
$
(541,642
)
Other comprehensive income (loss) before reclassifications
    
48,305
      
(8,237
)
    
(381
)
    
39,687
  
Amounts reclassified from accumulated other comprehensive loss
    
—
      
1,463
      
963
      
2,426
  
Total other comprehensive income (loss)
    
48,305
      
(6,774
)
    
582
      
42,113
  
Balance at January 31, 2021
  
$
(257,171
)
  
$
(236,956
)
  
$
(5,402
)
  
$
(499,529
)
                                 
Balance at April 30, 2020
  
$
(340,703
)
  
$
(227,920
)
  
$
(6,874
)
  
$
(575,497
)
Other comprehensive income (loss) before reclassifications
    
83,532
      
(13,527
)
    
(1,302
)
    
68,703
  
Amounts reclassified from accumulated other comprehensive loss
    
—
      
4,491
      
2,774
      
7,265
  
Total other comprehensive income (loss)
    
83,532
      
(9,036
)
    
1,472
      
75,968
  
Balance at January 31, 2021
  
$
(257,171
)
  
$
(236,956
)
  
$
(5,402
)
  
$
(499,529
)