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Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Income (Loss), Net (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2018
Jan. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 1,083,439  
Ending balance $ 1,177,959   1,177,959  
Accumulated Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (43,294) $ (54,598) (55,359) $ (36,339)
Unrealized (losses) gains arising during the period 17,793 (1,321) 29,858 (19,580)
Ending balance (25,501) (55,919) (25,501) (55,919)
Accumulated Defined Benefit Plan Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (14,423) [1] (20,645) [2] (15,127) [1] (21,572) [2]
Reclassification of realized net losses to net income 361 [1] 465 [2] 1,065 [1] 1,392 [2]
Ending balance (14,062) [1] (20,180) [2] (14,062) [1] (20,180) [2]
Unrealized (Losses) Gains on Interest Rate Swap        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance [3] (185)   (578)  
Unrealized (losses) gains arising during the period [3] 973   1,061  
Reclassification of realized net losses to net income [3] 104   409  
Ending balance [3] 892   892  
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (57,902) (75,243) (71,064) (57,911)
Unrealized (losses) gains arising during the period 18,766 (1,321) 30,919 (19,580)
Reclassification of realized net losses to net income 465 465 1,474 1,392
Ending balance $ (38,671) $ (76,099) $ (38,671) $ (76,099)
[1] The tax effect on the reclassifications of realized net losses was $0.0 million and $0.0 million for the three and nine months ended January 31, 2018, 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, 2017, respectively.
[3] The tax effect on unrealized gains was $0.0 million and $0.0 million for the three and nine months ended January 31, 2018, respectively. The tax effect on the reclassification of realized net losses to net income was $0.0 million and $0.0 million for the three and nine months ended January 31, 2018, respectively.