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Summary of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Balance as of April 30, 2016 $ 1,047,301  
Net income 4,068 $ 23,082
Foreign currency translation adjustments (13,274) (15,632)
Deferred compensation and pension plan adjustments, net of tax 462 $ 447
Dividends declared (5,909)  
Purchase of stock (4,161)  
Issuance of stock 2,784  
Stock-based compensation 4,739  
Tax benefit from exercise of stock options and vesting of restricted stock 332  
Balance as of July 31, 2016 1,036,342  
Parent    
Balance as of April 30, 2016 1,045,300  
Net income 3,208  
Foreign currency translation adjustments (13,128)  
Deferred compensation and pension plan adjustments, net of tax 462  
Dividends declared (5,909)  
Purchase of stock (4,161)  
Issuance of stock 2,784  
Stock-based compensation 4,739  
Tax benefit from exercise of stock options and vesting of restricted stock 332  
Balance as of July 31, 2016 1,033,627  
Noncontrolling Interest    
Balance as of April 30, 2016 2,001  
Net income 860  
Foreign currency translation adjustments (146)  
Balance as of July 31, 2016 $ 2,715