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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Jan. 31, 2018
Jan. 31, 2017
Jan. 31, 2018
Jan. 31, 2017
Beginning balance $ 1,134,723 $ 1,054,144 $ 1,087,048 $ 1,047,301
Net income 27,427 24,378 93,588 59,502
Foreign currency translation adjustments 17,839 (1,583) 29,773 (20,016)
Deferred compensation and pension plan adjustments, net of tax 361 465 1,065 1,392
Unrealized gain on interest rate swap, net of tax 1,077   1,470  
Dividends paid to shareholders (5,705) (5,796) (17,242) (17,546)
Dividends paid to noncontrolling interest   (1,229) (1,558) (1,229)
Purchase of stock (3,503) (9,578) (36,225) (20,695)
Issuance of stock 3,412 2,778 7,998 5,746
Stock-based compensation 5,263 4,406 14,977 13,497
Tax benefit from exercise of stock options and vesting of restricted stock   17   50
Balance as of January 31 1,180,894 1,068,002 1,180,894 1,068,002
Parent        
Beginning balance 1,132,014 1,050,553 1,083,439 1,045,300
Net income 27,247 23,897 92,619 57,257
Foreign currency translation adjustments 17,793 (1,321) 29,858 (19,580)
Deferred compensation and pension plan adjustments, net of tax 361 465 1,065 1,392
Unrealized gain on interest rate swap, net of tax 1,077   1,470  
Dividends paid to shareholders (5,705) (5,796) (17,242) (17,546)
Purchase of stock (3,503) (9,578) (36,225) (20,695)
Issuance of stock 3,412 2,778 7,998 5,746
Stock-based compensation 5,263 4,406 14,977 13,497
Tax benefit from exercise of stock options and vesting of restricted stock   17   50
Balance as of January 31 1,177,959 1,065,421 1,177,959 1,065,421
Noncontrolling Interest        
Beginning balance 2,709 3,591 3,609 2,001
Net income 180 481 969 2,245
Foreign currency translation adjustments 46 (262) (85) (436)
Dividends paid to noncontrolling interest   (1,229) (1,558) (1,229)
Balance as of January 31 $ 2,935 $ 2,581 $ 2,935 $ 2,581