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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Retained Earnings
--- | --- | --- | ---
Beginning Balance (shares) at Apr. 30, 2013 |  | 38,352,509 |
Beginning Balance at Apr. 30, 2013 | $ 593,387 | $ 23,119 | $ 570,268
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Net income | 126,820 |  | 126,820
Dividends declared | (27,702) |  | (27,702)
Exercise of stock options (shares) |  | 140,785 |
Exercise of stock options | 3,368 | $ 3,368 |
Tax benefits related to nonqualified stock options | 1,791 | $ 1,791 |
Stock-based compensation (shares) |  | 14,093 |
Stock-based compensation | 5,600 | $ 5,600 |
Beginning Balance (shares) at Apr. 30, 2014 |  | 38,507,387 |
Beginning Balance at Apr. 30, 2014 | 703,264 | $ 33,878 | 669,386
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Net income | 180,628 |  | 180,628
Dividends declared | (31,059) |  | (31,059)
Exercise of stock options (shares) |  | 310,224 |
Exercise of stock options | 11,465 | $ 11,465 |
Tax benefits related to nonqualified stock options | 3,624 | $ 3,624 |
Stock-based compensation (shares) |  | 68,554 |
Stock-based compensation | $ 7,307 | $ 7,307 |
Beginning Balance (shares) at Apr. 30, 2015 | 38,886,165 | 38,886,165 |
Beginning Balance at Apr. 30, 2015 | $ 875,229 | $ 56,274 | 818,955
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Net income | 225,982 |  | 225,982
Dividends declared | (34,342) |  | (34,342)
Exercise of stock options (shares) |  | 108,100 |
Exercise of stock options | 3,717 | $ 3,717 |
Issuance of common stock (shares) |  | 32,717 |
Issuance of common stock | 2,762 | $ 2,762 |
Tax benefits related to nonqualified stock options | 2,702 | $ 2,702 |
Stock-based compensation (shares) |  | 28,588 |
Stock-based compensation | $ 7,413 | $ 7,413 |
Beginning Balance (shares) at Apr. 30, 2016 | 39,055,570 | 39,055,570 |
Beginning Balance at Apr. 30, 2016 | $ 1,083,463 | $ 72,868 | $ 1,010,595

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