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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2017 | Oct. 31, 2016
Beginning balance | $ 1,128,751 | $ 1,036,342 | $ 1,087,048 | $ 1,047,301
Net income | 36,732 | 31,056 | 66,161 | 35,124
Foreign currency translation adjustments | (4,255) | (5,159) | 11,934 | (18,433)
Deferred compensation and pension plan adjustments, net of tax | 352 | 465 | 704 | 927
Unrealized gain on interest rate swap, net of tax | 456 |  | 393 |
Dividends paid to shareholders | (5,714) | (5,841) | (11,537) | (11,750)
Dividends paid to noncontrolling interest | (1,558) |  | (1,558) |
Purchase of stock | (25,350) | (6,956) | (32,722) | (11,117)
Issuance of stock |  | 184 | 4,586 | 2,968
Stock-based compensation | 5,309 | 4,352 | 9,714 | 9,091
Tax benefit (deficit) from exercise of stock options and vesting of restricted stock |  | (299) |  |
Tax benefit (deficit) from exercise of stock options and vesting of restricted stock |  |  |  | 33
Balance as of October 31 | 1,134,723 | 1,054,144 | 1,134,723 | 1,054,144
Parent |  |  |  |
Beginning balance | 1,124,649 | 1,033,627 | 1,083,439 | 1,045,300
Net income | 36,331 | 30,152 | 65,372 | 33,360
Foreign currency translation adjustments | (4,019) | (5,131) | 12,065 | (18,259)
Deferred compensation and pension plan adjustments, net of tax | 352 | 465 | 704 | 927
Unrealized gain on interest rate swap, net of tax | 456 |  | 393 |
Dividends paid to shareholders | (5,714) | (5,841) | (11,537) | (11,750)
Purchase of stock | (25,350) | (6,956) | (32,722) | (11,117)
Issuance of stock |  | 184 | 4,586 | 2,968
Stock-based compensation | 5,309 | 4,352 | 9,714 | 9,091
Tax benefit (deficit) from exercise of stock options and vesting of restricted stock |  | (299) |  |
Tax benefit (deficit) from exercise of stock options and vesting of restricted stock |  |  |  | 33
Balance as of October 31 | 1,132,014 | 1,050,553 | 1,132,014 | 1,050,553
Noncontrolling Interest |  |  |  |
Beginning balance | 4,102 | 2,715 | 3,609 | 2,001
Net income | 401 | 904 | 789 | 1,764
Foreign currency translation adjustments | (236) | (28) | (131) | (174)
Dividends paid to noncontrolling interest | (1,558) |  | (1,558) |
Balance as of October 31 | $ 2,709 | $ 3,591 | $ 2,709 | $ 3,591

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