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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 |

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