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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Apr. 30, 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 fiscal years ended April 30, 2018 and 2017, were as follows:

  
Foreign Currency
Translation Adjustment
  
Unamortized
Retirement Costs
  
Interest
Rate Swaps
  
Total
 
Balance at April 30, 2016
 
$
(267,920
)
 
$
(179,405
)
 
$
(361
)
 
$
(447,686
)
Other comprehensive (loss) income before reclassifications
  
(51,292
)
  
(18,458
)
  
2,735
   
(67,015
)
Amounts reclassified from Accumulated Other Comprehensive Loss
  
—
   
7,361
   
53
   
7,414
 
Total other comprehensive (loss) income
  
(51,292
)
  
(11,097
)
  
2,788
   
(59,601
)
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
)