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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 |

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