Annual report pursuant to Section 13 and 15(d)

Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail)

v3.20.2
Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance $ 1,240,656    
Ending balance 1,221,381 $ 1,240,656  
Foreign Currency Translation      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (60,270) (32,399) $ (55,359)
Unrealized (losses) gains arising during the period (23,382) (27,871) 22,960
Ending balance (83,652) (60,270) (32,399)
Deferred Compensation and Pension Plan      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance [1] (16,838) (9,073) (15,127)
Effect of adoption of accounting standard [1]   (2,396)  
Unrealized (losses) gains arising during the period [1] (8,883) (6,461) 4,813
Reclassification of realized losses (gains) to net income [1] 2,167 1,092 1,241
Ending balance [1] (23,554) (16,838) (9,073)
Unrealized Gains (Losses) on Marketable Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Unrealized (losses) gains arising during the period 37    
Reclassification of realized losses (gains) to net income (3)    
Ending balance 34    
Unrealized (Losses) Gains on Interest Rate Swap      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance [2] 456 1,337 (578)
Effect of adoption of accounting standard [2]   199  
Unrealized (losses) gains arising during the period [2] (678) (800) 1,465
Reclassification of realized losses (gains) to net income [2] 222 (280) 450
Ending balance [2]   456 1,337
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning balance (76,652) (40,135) (71,064)
Effect of adoption of accounting standard   (2,197)  
Unrealized (losses) gains arising during the period (32,906) (35,132) 29,238
Reclassification of realized losses (gains) to net income 2,386 812 1,691
Ending balance $ (107,172) $ (76,652) $ (40,135)
[1] The tax effects on unrealized (losses) gains were $(3.1) million, $(2.3) million and $2.5 million as of April 30, 2020, 2019 and 2018, respectively. The tax effects on reclassifications of realized net losses were $0.8 million, $0.4 million and $0.8 million as of April 30, 2020, 2019 and 2018, respectively.
[2] The tax effects on unrealized (losses) gains were $(0.2) million, $(0.3) million and $0.8 million as of April 30, 2020, 2019 and 2018, respectively. The tax effect on the reclassification of realized net (losses) gains to net income was $(0.1) million, $0.1 million and $(0.3) million as of April 30, 2020 2019 and 2018, respectively.