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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Jul. 31, 2018
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, 2018 and 2017 were as follows:

  
Foreign Currency Translation
  
Unamortized Retirement Costs
  
Interest Rate Swaps
  
Total
 
Balance at April 30, 2018
 
$
(251,573
)
 
$
(191,026
)
 
$
3,019
  
$
(439,580
)
Other comprehensive (loss) income before reclassifications
  
(40,325
)
  
7,720
   
70
   
(32,535
)
Amounts reclassified from accumulated other comprehensive loss
  
—
   
1,091
   
(722
)
  
369
 
Total other comprehensive (loss) income
  
(40,325
)
  
8,811
   
(652
)
  
(32,166
)
Balance at July 31, 2018
 
$
(291,898
)
 
$
(182,215
)
 
$
2,367
  
$
(471,746
)
                 
Balance at April 30, 2017
 
$
(319,212
)
 
$
(190,502
)
 
$
2,427
  
$
(507,287
)
Other comprehensive income (loss) before reclassifications
  
27,405
   
(3,017
)
  
(432
)
  
23,956
 
Amounts reclassified from accumulated other comprehensive loss
  
—
   
1,070
   
71
   
1,141
 
Total other comprehensive income (loss)
  
27,405
   
(1,947
)
  
(361
)
  
25,097
 
Balance at July 31, 2017
 
$
(291,807
)
 
$
(192,449
)
 
$
2,066
  
$
(482,190
)