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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Retained Earnings
--- | --- | --- | ---
Beginning Balance (shares) at Apr. 30, 2012 |  | 38,140,309 |
Beginning Balance at Apr. 30, 2012 | $ 503,944 | $ 12,199 | $ 491,745
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Net income | 103,814 |  | 103,814
Dividends declared | (25,291) |  | (25,291)
Exercise of stock options (shares) |  | 198,200 |
Exercise of stock options | 4,721 | $ 4,721 |
Tax benefits related to nonqualified stock options | 1,929 | $ 1,929 |
Stock-based compensation (shares) |  | 14,000 |
Stock-based compensation | 4,270 | $ 4,270 |
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 | 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

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