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Comprehensive Income (Loss) - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 1,240,656  
Ending balance $ 1,275,100   1,275,100  
Foreign Currency Translation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (64,303) $ (59,472) (60,270) $ (32,399)
Unrealized gains (losses) arising during the period 403 6,017 (3,630) (21,056)
Ending balance (63,900) (53,455) (63,900) (53,455)
Deferred Compensation and Pension Plan        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (15,848) [1] (10,923) [2] (16,838) [1] (9,073) [2]
Unrealized gains (losses) arising during the period [1] 450   450  
Reclassification of realized net losses (gains) to net income 493 [1] 273 [2] 1,483 [1] 819 [2]
Effect of adoption of accounting standard [2]       (2,396)
Ending balance (14,905) [1] (10,650) [2] (14,905) [1] (10,650) [2]
Unrealized Gains (Losses) on Marketable Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Unrealized gains (losses) arising during the period (5)   (5)  
Ending balance (5)   (5)  
Unrealized (Losses) Gains on Interest Rate Swap        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (495) [3] 1,814 [4] 456 [3] 1,337 [4]
Unrealized gains (losses) arising during the period 128 [3] (880) [4] (678) [3] (538) [4]
Reclassification of realized net losses (gains) to net income 367 [3] (100) [4] 222 [3] (164) [4]
Effect of adoption of accounting standard [4]       199
Ending balance [4]   834   834
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (80,646) (68,581) (76,652) (40,135)
Unrealized gains (losses) arising during the period 976 5,137 (3,863) (21,594)
Reclassification of realized net losses (gains) to net income 860 173 1,705 655
Effect of adoption of accounting standard       (2,197)
Ending balance $ (78,810) $ (63,271) $ (78,810) $ (63,271)
[1] The tax effect on unrealized gains was $0.2 million for both the three and nine months ended January 31, 2020, respectively. The tax effect on the reclassifications of realized net losses was $0.2 million and $0.5 million for the three and nine months ended January 31, 2020, respectively.
[2] 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.
[3] The tax effect on unrealized gains (losses) was $0.1 million and ($0.2) million for the three and nine months ended January 31, 2020, respectively. The tax effect on the reclassification of realized net losses to net income was $0.1 million for both the three and nine months ended January 31, 2020, respectively.
[4] 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.