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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Jul. 31, 2017
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, 2017 and 2016 were as follows (in thousands):
 
 
Foreign
 
Unamortized
 
Interest
  
 
Currency
 
Retirement
 
Rate
  
 
Translation
 
Costs
 
Swaps
 
Total
        
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)
        
Balance at April 30, 2016
 $(267,920)
 
 $(179,405)
 
 $(361)
 
 $(447,686)
  Other comprehensive income (loss) before reclassifications
 (44,640)
 
9,668
 
(1,055)
 
 (36,027)
  Amounts reclassified from accumulated other comprehensive loss
-
 
(664)
 
225
 
 (439)
  Total other comprehensive income (loss)
 (44,640)
 
9,004
 
 (830)
 
 (36,466)
Balance at July 31, 2016
 $(312,560)
 
 $(170,401)
 
 $(1,191)
 
 $(484,152)