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Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at Apr. 30, 2015 | $ 194,370 | $ 70 | $ 219,198 | $ 147,352 | $ 73 | $ (172,323)
Balance (in shares) at Apr. 30, 2015 |  | 69,625,000 |  |  |  |
Treasury stock, shares at Apr. 30, 2015 |  |  |  |  |  | 15,563,000
Proceeds from exercise of employee stock options | $ 9,570 | $ 2 | 9,568 |  |  |
Proceeds from exercise of employee stock options (in shares) | 1,490,270 | 1,490,000 |  |  |  |
Stock-based compensation | $ 6,472 |  | 6,472 |  |  |
Excess tax benefit for stock-based compensation | 5,218 |  | 5,218 |  |  |
Shares issued under employee stock purchase plan | 1,695 |  | 1,695 |  |  |
Shares issued under employee stock purchase plan (in shares) |  | 158,000 |  |  |  |
Change in unrealized income (loss) on interest rate swap, net of tax effect | (821) |  |  |  | (821) |
Issuance of common stock under restricted stock unit awards, net of shares surrendered | (2,646) |  | (2,646) |  |  |
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares) |  | 286,000 |  |  |  |
Net income | 93,958 |  |  | 93,958 |  |
Balance at Apr. 30, 2016 | 307,816 | $ 72 | 239,505 | 241,310 | (748) | $ (172,323)
Balance (in shares) at Apr. 30, 2016 |  | 71,559,000 |  |  |  |
Treasury stock, shares at Apr. 30, 2016 |  |  |  |  |  | 15,563,000
Proceeds from exercise of employee stock options | $ 193 |  | 193 |  |  |
Proceeds from exercise of employee stock options (in shares) | 54,200 | 54,000 |  |  |  |
Repurchase of common stock | $ (50,052) |  |  |  |  | $ (50,052)
Repurchase of common stock (in shares) | (2,600,000) |  |  |  |  | 2,604,000
Stock-based compensation | $ 8,590 |  | 8,590 |  |  |
Shares issued under employee stock purchase plan | 2,249 |  | 2,249 |  |  |
Shares issued under employee stock purchase plan (in shares) |  | 144,000 |  |  |  |
Change in unrealized income (loss) on interest rate swap, net of tax effect | 1,184 |  |  |  | 1,184 |
Issuance of common stock under restricted stock unit awards, net of shares surrendered | (4,672) |  | (4,672) |  |  |
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares) |  | 260,000 |  |  |  |
Net income | 127,854 |  |  | 127,854 |  |
Balance at Apr. 30, 2017 | $ 393,162 | $ 72 | 245,865 | 369,164 | 436 | $ (222,375)
Balance (in shares) at Apr. 30, 2017 | 53,850,426 | 72,017,000 |  |  |  |
Treasury stock, shares at Apr. 30, 2017 | 18,166,862 |  |  |  |  | 18,167,000
Proceeds from exercise of employee stock options | $ 67 |  | 67 |  |  |
Proceeds from exercise of employee stock options (in shares) | 19,000 | 19,000 |  |  |  |
Repurchase of common stock (in shares) | 0 |  |  |  |  |
Stock-based compensation | $ 7,815 |  | 7,815 |  |  |
Shares issued under employee stock purchase plan | 2,146 |  | 2,146 |  |  |
Shares issued under employee stock purchase plan (in shares) |  | 203,000 |  |  |  |
Change in unrealized income (loss) on interest rate swap, net of tax effect | 1,107 |  |  |  | 1,107 |
Reclassification due to U.S. Tax Reform |  |  |  | (146) | 146 |
Issuance of common stock under restricted stock unit awards, net of shares surrendered | (2,277) |  | (2,277) |  |  |
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares) |  | 195,000 |  |  |  |
Net income | 20,128 |  |  | 20,128 |  |
Balance at Apr. 30, 2018 | $ 422,148 | $ 72 | $ 253,616 | $ 389,146 | $ 1,689 | $ (222,375)
Balance (in shares) at Apr. 30, 2018 | 54,266,843 | 72,434,000 |  |  |  |
Treasury stock, shares at Apr. 30, 2018 | 18,166,862 |  |  |  |  | 18,167,000

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