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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Oct. 31, 2014
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 six months ended October 31, 2014 were as follows (in thousands):

  
Foreign
Currency
Translation
  
Unamortized
Retirement
Costs
  
Interest
Rate
Swaps
  
Total
 
         
Balance at July 31, 2014
 
$
(69,522
)
 
$
(121,903
)
 
$
(336
)
 
$
(191,761
)
Other comprehensive income (loss) before reclassifications
  
(63,930
)
  
3,917
   
(497
)
  
(60,510
)
Amounts reclassified from accumulated other comprehensive loss
  
-
   
1,511
   
270
   
1,781
 
Total other comprehensive income (loss)
 
 
(63,930
)
 
 
5,428
  
 
(227
)
 
 
(58,729
)
Balance at October 31, 2014
 
$
(133,452
)
 
$
(116,475
)
 
$
(563
)
 
$
(250,490
)

  
Foreign
Currency
Translation
  
Unamortized
Retirement
Costs
  
Interest
Rate
Swaps
  
Total
 
         
Balance at April 30, 2014
 
$
(66,664
)
 
$
(123,025
)
 
$
(602
)
 
$
(190,291
)
Other comprehensive income (loss) before reclassifications
  
(66,788
)
  
3,441
   
(423
)
  
(63,770
)
Amounts reclassified from accumulated other comprehensive loss
  
-
   
3,109
   
462
   
3,571
 
Total other comprehensive income (loss)
 
 
(66,788
)
 
 
6,550
  
 
39
  
 
(60,199
)
Balance at October 31, 2014
 
$
(133,452
)
 
$
(116,475
)
 
$
(563
)
 
$
(250,490
)

  
Foreign
Currency
Translation
  
Unamortized
Retirement
Costs
  
Interest
Rate
Swaps
  
Total
 
         
Balance at July 31, 2013
 
$
(144,342
)
 
$
(140,319
)
 
$
(693
)
 
$
(285,354
)
Other comprehensive income (loss) before reclassifications
  
50,940
   
(3,704
)
  
(127
)
  
47,109
 
Amounts reclassified from accumulated other comprehensive loss
  
-
   
2,598
   
184
   
2,782
 
Total other comprehensive income (loss)
  
50,940
   
(1,106
)
  
57
   
49,891
 
Balance at October 31, 2013
 
$
(93,402
)
 
$
(141,425
)
 
$
(636
)
 
$
(235,463
)

  
Foreign
Currency
Translation
  
Unamortized
Retirement
Costs
  
Interest
Rate
Swaps
  
Total
 
         
Balance at April 30, 2013
 
$
(134,539
)
 
$
(143,124
)
 
$
(969
)
 
$
(278,632
)
Other comprehensive income (loss) before reclassifications
  
41,137
   
(3,394
)
  
(29
)
  
37,714
 
Amounts reclassified from accumulated other comprehensive loss
  
-
   
5,093
   
362
   
5,455
 
Total other comprehensive income
  
41,137
   
1,699
   
333
   
43,169
 
Balance at October 31, 2013
 
$
(93,402
)
 
$
(141,425
)
 
$
(636
)
 
$
(235,463
)