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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Oct. 31, 2017
Oct. 31, 2016
Beginning balance $ 1,128,751 $ 1,036,342 $ 1,087,048 $ 1,047,301
Net income 36,732 31,056 66,161 35,124
Foreign currency translation adjustments (4,255) (5,159) 11,934 (18,433)
Deferred compensation and pension plan adjustments, net of tax 352 465 704 927
Unrealized gain on interest rate swap, net of tax 456   393  
Dividends paid to shareholders (5,714) (5,841) (11,537) (11,750)
Dividends paid to noncontrolling interest (1,558)   (1,558)  
Purchase of stock (25,350) (6,956) (32,722) (11,117)
Issuance of stock   184 4,586 2,968
Stock-based compensation 5,309 4,352 9,714 9,091
Tax benefit (deficit) from exercise of stock options and vesting of restricted stock   (299)    
Tax benefit (deficit) from exercise of stock options and vesting of restricted stock       33
Balance as of October 31 1,134,723 1,054,144 1,134,723 1,054,144
Parent        
Beginning balance 1,124,649 1,033,627 1,083,439 1,045,300
Net income 36,331 30,152 65,372 33,360
Foreign currency translation adjustments (4,019) (5,131) 12,065 (18,259)
Deferred compensation and pension plan adjustments, net of tax 352 465 704 927
Unrealized gain on interest rate swap, net of tax 456   393  
Dividends paid to shareholders (5,714) (5,841) (11,537) (11,750)
Purchase of stock (25,350) (6,956) (32,722) (11,117)
Issuance of stock   184 4,586 2,968
Stock-based compensation 5,309 4,352 9,714 9,091
Tax benefit (deficit) from exercise of stock options and vesting of restricted stock   (299)    
Tax benefit (deficit) from exercise of stock options and vesting of restricted stock       33
Balance as of October 31 1,132,014 1,050,553 1,132,014 1,050,553
Noncontrolling Interest        
Beginning balance 4,102 2,715 3,609 2,001
Net income 401 904 789 1,764
Foreign currency translation adjustments (236) (28) (131) (174)
Dividends paid to noncontrolling interest (1,558)   (1,558)  
Balance as of October 31 $ 2,709 $ 3,591 $ 2,709 $ 3,591