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Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jul. 31, 2017 | Jul. 31, 2016
Balance as of April 30, 2017 | $ 1,087,048 | $ 1,047,301
Net income | 29,429 | 4,068
Foreign currency translation adjustments | 16,189 | (13,274)
Deferred compensation and pension plan adjustments, net of tax | 352 | 462
Net unrealized loss on interest rate swap, net of tax | (63) |
Dividends paid to shareholders | (5,823) | (5,909)
Purchase of stock | (7,372) | (4,161)
Issuance of stock | 4,586 | 2,784
Stock-based compensation | 4,405 | 4,739
Tax benefit from exercise of stock options and vesting of restricted stock |  | 332
Balance as of July 31, 2017 | 1,128,751 | 1,036,342
Parent |  |
Balance as of April 30, 2017 | 1,083,439 | 1,045,300
Net income | 29,041 | 3,208
Foreign currency translation adjustments | 16,084 | (13,128)
Deferred compensation and pension plan adjustments, net of tax | 352 | 462
Net unrealized loss on interest rate swap, net of tax | (63) |
Dividends paid to shareholders | (5,823) | (5,909)
Purchase of stock | (7,372) | (4,161)
Issuance of stock | 4,586 | 2,784
Stock-based compensation | 4,405 | 4,739
Tax benefit from exercise of stock options and vesting of restricted stock |  | 332
Balance as of July 31, 2017 | 1,124,649 | 1,033,627
Noncontrolling Interest |  |
Balance as of April 30, 2017 | 3,609 | 2,001
Net income | 388 | 860
Foreign currency translation adjustments | 105 | (146)
Balance as of July 31, 2017 | $ 4,102 | $ 2,715

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