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Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 1,045,300  
Unrealized losses arising during the period (13,128) $ (15,636)
Reclassification of realized net losses to net income 462 447
Ending balance 1,033,627  
Accumulated Translation Adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (36,339) (20,919)
Unrealized losses arising during the period (13,128) (15,632)
Ending balance (49,467) (36,551)
Accumulated Defined Benefit Plans Adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance [1] (21,572) (19,708)
Reclassification of realized net losses to net income [1] 462 447
Ending balance [1] (21,110) (19,261)
Accumulated Net Unrealized Investment Gain (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance   4
Unrealized losses arising during the period   (4)
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (57,911) (40,623)
Ending balance $ (70,577) $ (55,812)
[1] The tax effect on the reclassifications of realized net losses was $0.3 million for both the three months ended July 31, 2016 and 2015.