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Summary of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Oct. 31, 2016
Oct. 31, 2015
Oct. 31, 2016
Oct. 31, 2015
Balance as of April 30, 2016 $ 1,036,342   $ 1,047,301  
Net income 31,056 $ 17,971 35,124 $ 41,053
Foreign currency translation adjustments (5,159) (1,351) (18,433) (16,983)
Deferred compensation and pension plan adjustments, net of tax 465 $ 448 927 $ 895
Dividends declared (5,841)   (11,750)  
Purchase of stock (6,956)   (11,117)  
Issuance of stock 184   2,968  
Stock-based compensation 4,352   9,091  
Tax benefit (deficit) from exercise of stock options and vesting of restricted stock (299)   33  
Balance as of October 31, 2016 1,054,144   1,054,144  
Parent        
Balance as of April 30, 2016 1,033,627   1,045,300  
Net income 30,152   33,360  
Foreign currency translation adjustments (5,131)   (18,259)  
Deferred compensation and pension plan adjustments, net of tax 465   927  
Dividends declared (5,841)   (11,750)  
Purchase of stock (6,956)   (11,117)  
Issuance of stock 184   2,968  
Stock-based compensation 4,352   9,091  
Tax benefit (deficit) from exercise of stock options and vesting of restricted stock (299)   33  
Balance as of October 31, 2016 1,050,553   1,050,553  
Noncontrolling Interest        
Balance as of April 30, 2016 2,715   2,001  
Net income 904   1,764  
Foreign currency translation adjustments (28)   (174)  
Balance as of October 31, 2016 $ 3,591   $ 3,591