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Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 1,045,300  
Unrealized losses arising during the period $ (1,321) $ (11,447) (19,580) $ (28,434)
Reclassification of realized net losses to net income 465 447 1,392 1,342
Ending balance 1,065,421   1,065,421  
Accumulated Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (54,598) (37,902) (36,339) (20,919)
Unrealized losses arising during the period (1,321) (11,447) (19,580) (28,430)
Ending balance (55,919) (49,349) (55,919) (49,349)
Accumulated Defined Benefit Plans Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (20,645) [1] (18,813) [2] (21,572) [1] (19,708) [2]
Reclassification of realized net losses to net income 465 [1] 447 [2] 1,392 [1] 1,342 [2]
Ending balance (20,180) [1] (18,366) [2] (20,180) [1] (18,366) [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 (75,243) (56,715) (57,911) (40,623)
Ending balance $ (76,099) $ (67,715) $ (76,099) $ (67,715)
[1] The tax effect on the reclassifications of realized net losses was $0.3 million and $0.9 million for the three and nine months ended January 31, 2017, respectively.
[2] The tax effect on the reclassifications of realized net losses was $0.3 million and $0.9 million for the three and nine months ended January 31, 2016, respectively.