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Accumulated Other Comprehensive Loss (Tables)
 9 Months Ended
Jan. 31, 2021
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, 2021 and 2020 were as follows:

  
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
)

 
Foreign
Currency
Translation
    
Unamortized
Retirement
Costs
    
Interest
Rate Swaps
    
Total
  
                         
Balance at October 31, 2019
  
$
(309,327
)
  
$
(194,465
)
  
$
(1,234
)
  
$
(505,026
)
Other comprehensive income (loss) before reclassifications
    
7,895
      
(2,063
)
    
(271
)
    
5,561
  
Amounts reclassified from accumulated other comprehensive loss
    
—
      
1,247
      
(122
)
    
1,125
  
Total other comprehensive income (loss)
    
7,895
      
(816
)
    
(393
)
    
6,686
  
Balance at January 31, 2020
  
$
(301,432
)
  
$
(195,281
)
  
$
(1,627
)
  
$
(498,340
)
                                 
Balance at April 30, 2019
  
$
(312,107
)
  
$
(196,057
)
  
$
(574
)
  
$
(508,738
)
Other comprehensive income (loss) before reclassifications
    
10,675
      
(2,893
)
    
(424
)
    
7,358
  
Amounts reclassified from accumulated other comprehensive loss
    
—
      
3,669
      
(629
)
    
3,040
  
Total other comprehensive income (loss)
    
10,675
      
776
      
(1,053
)
    
10,398
  
Balance at January 31, 2020
  
$
(301,432
)
  
$
(195,281
)
  
$
(1,627
)
  
$
(498,340
)