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Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ 1,083,439  
Ending balance 1,124,649  
Accumulated Translation Adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (55,359) $ (36,339)
Unrealized gains (losses) arising during the period 16,084 (13,128)
Ending balance (39,275) (49,467)
Accumulated Defined Benefit Plan Adjustment    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance [1] (15,127) (21,572)
Reclassification of realized net losses to net income [1] 352 462
Ending balance [1] (14,775) (21,110)
Unrealized (Losses) on Interest Rate Swap    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance [2] (578)  
Unrealized gains (losses) arising during the period [2] (234)  
Reclassification of realized net losses to net income [2] 171  
Ending balance [2] (641)  
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (71,064) (57,911)
Unrealized gains (losses) arising during the period 15,850 (13,128)
Reclassification of realized net losses to net income 523 462
Ending balance $ (54,691) $ (70,577)
[1] The tax effect on the reclassifications of realized net losses was $0.2 million and $0.3 million for the three months ended July 31, 2017 and 2016, respectively.
[2] The tax effect on unrealized (losses) was $0.1 million for the three months ended July 31, 2017. The tax effect on the reclassification of realized net losses to net income was $0.1 million for the three months ended July 31, 2017.