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Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2019
Jan. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 1,216,607  
Ending balance $ 1,204,694   1,204,694  
Accumulated Translation Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (59,472) $ (43,294) (32,399) $ (55,359)
Unrealized gains (losses) arising during the period 6,017 17,793 (21,056) 29,858
Ending balance (53,455) (25,501) (53,455) (25,501)
Accumulated Defined Benefit Plan Adjustment        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (10,923) [1] (14,423) [2] (9,073) [1] (15,127) [2]
Reclassification of realized net losses (gains) to net income 273 [1] 361 [2] 819 [1] 1,065 [2]
Effect of adoption of accounting standard [1]     (2,396)  
Ending balance (10,650) [1] (14,062) [2] (10,650) [1] (14,062) [2]
Unrealize (Losses) Gains on Interest Rate Swap        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 1,814 [3] (185) [4] 1,337 [3] (578) [4]
Unrealized gains (losses) arising during the period (880) [3] 973 [4] (538) [3] 1,061 [4]
Reclassification of realized net losses (gains) to net income (100) [3] 104 [4] (164) [3] 409 [4]
Effect of adoption of accounting standard [3]     199  
Ending balance 834 [3] 892 [4] 834 [3] 892 [4]
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (68,581) (57,902) (40,135) (71,064)
Unrealized gains (losses) arising during the period 5,137 18,766 (21,594) 30,919
Reclassification of realized net losses (gains) to net income 173 465 655 1,474
Effect of adoption of accounting standard     (2,197)  
Ending balance $ (63,271) $ (38,671) $ (63,271) $ (38,671)
[1] The tax effect on the reclassifications of realized net losses was $0.1 million and $0.3 million for the three and nine months ended January 31, 2019, respectively.
[2] The tax effect on the reclassifications of realized net losses was $0.2 million and $0.7 million for the three and nine months ended January 31, 2018, respectively.
[3] The tax effect on unrealized losses was $0.3 million and $0.2 million for the three and nine months ended January 31, 2019, respectively. The tax effect on the reclassification of realized net gains to net income was $0.1 million for the nine months ended January 31, 2019.
[4] The tax effect on unrealized gains was $0.6 million and $0.6 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 $0.1 million and $0.3 million for the three and nine months ended January 31, 2018, respectively.