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Summary of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
Balance as of April 30, 2016 $ 1,054,144   $ 1,047,301  
Net income 24,378 $ (15,995) 59,502 $ 25,058
Foreign currency translation adjustments (1,583) (11,447) (20,016) (28,430)
Deferred compensation and pension plan adjustments, net of tax 465 $ 447 1,392 $ 1,342
Dividends paid to shareholders (5,796)   (17,546)  
Dividends paid to noncontrolling interest (1,229)   (1,229)  
Purchase of stock (9,578)   (20,695)  
Issuance of stock 2,778   5,746  
Stock-based compensation 4,406   13,497  
Tax benefit from exercise of stock options and vesting of restricted stock 17   50  
Balance as of January 31, 2017 1,068,002   1,068,002  
Parent        
Balance as of April 30, 2016 1,050,553   1,045,300  
Net income 23,897   57,257  
Foreign currency translation adjustments (1,321)   (19,580)  
Deferred compensation and pension plan adjustments, net of tax 465   1,392  
Dividends paid to shareholders (5,796)   (17,546)  
Purchase of stock (9,578)   (20,695)  
Issuance of stock 2,778   5,746  
Stock-based compensation 4,406   13,497  
Tax benefit from exercise of stock options and vesting of restricted stock 17   50  
Balance as of January 31, 2017 1,065,421   1,065,421  
Noncontrolling Interest        
Balance as of April 30, 2016 3,591   2,001  
Net income 481   2,245  
Foreign currency translation adjustments (262)   (436)  
Dividends paid to noncontrolling interest (1,229)   (1,229)  
Balance as of January 31, 2017 $ 2,581   $ 2,581