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Accumulated Other Comprehensive Loss
 9 Months Ended
Jan. 31, 2018
Accumulated Other Comprehensive Loss [Abstract]  
Accumulated Other Comprehensive Loss
4.
Accumulated Other Comprehensive Loss

Changes in Accumulated Other Comprehensive Loss by component, net of tax, for the three and nine months ended January 31, 2018 and 2017 were as follows:
 
  
Foreign
Currency
Translation
  
Unamortized
Retirement
Costs
  
Interest
Rate
Swaps
  
Total
 
             
Balance at October 31, 2017
 
$
(286,171
)
 
$
(193,028
)
 
$
2,473
  
$
(476,726
)
Other comprehensive income (loss) before reclassifications
  
51,401
   
(9,686
)
  
509
   
42,224
 
Amounts reclassified from accumulated other comprehensive loss
  
-
   
1,099
   
225
   
1,324
 
Total other comprehensive income (loss)
  
51,401
   
(8,587
)
  
734
   
43,548
 
Balance at January 31, 2018
 
$
(234,770
)
 
$
(201,615
)
 
$
3,207
  
$
(433,178
)
                 
Balance at April 30, 2017
 
$
(319,212
)
 
$
(190,502
)
 
$
2,427
  
$
(507,287
)
Other comprehensive income (loss) before reclassifications
  
84,442
   
(14,376
)
  
315
   
70,381
 
Amounts reclassified from accumulated other comprehensive loss
  
-
   
3,263
   
465
   
3,728
 
Total other comprehensive income (loss)
  
84,442
   
(11,113
)
  
780
   
74,109
 
Balance at January 31, 2018
 
$
(234,770
)
 
$
(201,615
)
 
$
3,207
  
$
(433,178
)
 
  
Foreign
Currency
Translation
  
Unamortized
Retirement
Costs
  
Interest
Rate
Swaps
  
Total
 
             
Balance at October 31, 2016
 
$
(338,384
)
 
$
(148,250
)
 
$
(15
)
 
$
(486,649
)
Other comprehensive income (loss) before reclassifications
  
7,783
   
(2,603
)
  
2,284
   
7,464
 
Amounts reclassified from accumulated other comprehensive loss
  
-
   
838
   
(70
)
  
768
 
Total other comprehensive income (loss)
  
7,783
   
(1,765
)
  
2,214
   
8,232
 
Balance at January 31, 2017
 
$
(330,601
)
 
$
(150,015
)
 
$
2,199
  
$
(478,417
)
                 
Balance at April 30, 2016
 
$
(267,920
)
 
$
(179,405
)
 
$
(361
)
 
$
(447,686
)
Other comprehensive (loss) income before reclassifications
  
(62,681
)
  
22,891
   
2,381
   
(37,409
)
Amounts reclassified from accumulated other comprehensive loss
  
-
   
6,499
   
179
   
6,678
 
Total other comprehensive (loss) income
  
(62,681
)
  
29,390
   
2,560
   
(30,731
)
Balance at January 31, 2017
 
$
(330,601
)
 
$
(150,015
)
 
$
2,199
  
$
(478,417
)
 
During the three months ended January 31, 2018 and 2017, pre-tax actuarial losses included in Unamortized Retirement Costs of approximately $1.5 million and $1.2 million, respectively, were amortized from Accumulated Other Comprehensive Loss and recognized as pension expense in Operating and Administrative Expenses in the Condensed Consolidated Statements of Income. During the nine months ended January 31, 2018 and 2017, pre-tax actuarial losses of approximately $4.4 million and $9.9 million, respectively, were amortized.