Annual report pursuant to Section 13 and 15(d)

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

v3.19.2
Comprehensive Income - Changes in Each Component of Accumulated Other Comprehensive (Loss) Income (Detail) - USD ($)
$ in Thousands
12 Months Ended
Apr. 30, 2019
Apr. 30, 2018
Apr. 30, 2017
Accumulated Other Comprehensive (Loss) Income [Line Items]      
Beginning balance $ 1,216,607    
Ending balance 1,240,656 $ 1,216,607  
Foreign Currency Translation      
Accumulated Other Comprehensive (Loss) Income [Line Items]      
Beginning balance (32,399) (55,359) $ (36,339)
Unrealized (losses) gains arising during the period (27,871) 22,960 (19,020)
Ending balance (60,270) (32,399) (55,359)
Deferred Compensation and Pension Plan      
Accumulated Other Comprehensive (Loss) Income [Line Items]      
Beginning balance [1] (9,073) (15,127) (21,572)
Unrealized (losses) gains arising during the period [1] (6,461) 4,813 4,584
Reclassification of realized losses (gains) to net income [1] 1,092 1,241 1,861
Effect of adoption of accounting standard [1] (2,396)    
Ending balance [1] (16,838) (9,073) (15,127)
Unrealized (Losses) Gains on Interest Rate Swap      
Accumulated Other Comprehensive (Loss) Income [Line Items]      
Beginning balance [2] 1,337 (578)  
Unrealized (losses) gains arising during the period [2] (800) 1,465 (635)
Reclassification of realized losses (gains) to net income [2] (280) 450 57
Effect of adoption of accounting standard [2] 199    
Ending balance [2] 456 1,337 (578)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive (Loss) Income [Line Items]      
Beginning balance (40,135) (71,064) (57,911)
Unrealized (losses) gains arising during the period (35,132) 29,238 (15,071)
Reclassification of realized losses (gains) to net income 812 1,691 1,918
Effect of adoption of accounting standard (2,197)    
Ending balance $ (76,652) $ (40,135) $ (71,064)
[1] The tax effects on unrealized (losses) gains were $(2.3) million, $2.5 million and $1.9 million as of April 30, 2019, 2018 and 2017, respectively. The tax effects on reclassifications of realized net losses were $0.4 million, $0.8 million and $1.2 million as of April 30, 2019, 2018 and 2017, respectively.
[2] The tax effects on unrealized (losses) gains were $(0.3) million, $0.8 million and $(0.4) million as of April 30, 2019, 2018 and 2017, respectively. The tax effect on the reclassification of realized net gains (losses) to net income was $0.1 million and $(0.3) million as of April 30, 2019 and 2018, respectively.