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Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 1,045,300  
Unrealized losses arising during the period $ (5,131) $ (1,351) (18,259) $ (16,987)
Reclassification of realized net losses to net income 465 448 927 895
Ending balance 1,050,553   1,050,553  
Accumulated Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (49,467) (36,551) (36,339) (20,919)
Unrealized losses arising during the period (5,131) (1,351) (18,259) (16,983)
Ending balance (54,598) (37,902) (54,598) (37,902)
Accumulated Defined Benefit Plans Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (21,110) [1] (19,261) [2] (21,572) [1] (19,708) [2]
Reclassification of realized net losses to net income 465 [1] 448 [2] 927 [1] 895 [2]
Ending balance (20,645) [1] (18,813) [2] (20,645) [1] (18,813) [2]
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 (70,577) (55,812) (57,911) (40,623)
Ending balance $ (75,243) $ (56,715) $ (75,243) $ (56,715)
[1] The tax effect on the reclassifications of realized net losses was $0.3 million and $0.6 million for the three and six months ended October 31, 2016, respectively.
[2] The tax effect on the reclassifications of realized net losses was $0.3 million and $0.6 million for the three and six months ended October 31, 2015, respectively.