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Condensed Consolidated Statement of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income/(Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at Apr. 30, 2018 | $ 422,148 | $ 72 | $ 253,616 | $ 389,146 | $ 1,689 | $ (222,375)
Balance (in shares) at Apr. 30, 2018 |  | 72,434,000 |  |  |  |
Treasury stock, shares at Apr. 30, 2018 |  |  |  |  |  | 18,167,000
Proceeds from exercise of employee stock options | $ 215 |  | 215 |  |  |
Proceeds from exercise of employee stock options (in shares) | 32,899 | 33,000 |  |  |  |
Stock-based compensation | $ 3,952 |  | 3,952 |  |  |
Shares issued under employee stock purchase plan | 943 |  | 943 |  |  |
Shares issued under employee stock (in shares) |  | 108,000 |  |  |  |
Change in unrealized loss on interest rate swap, net of tax effect | (117) |  |  |  | (117) |
Impact of adoption of accounting standard updates | (4,610) |  |  | (4,610) |  |
Issuance of common stock under restricted stock unit awards, net of shares surrendered | (599) | $ 1 | (600) |  |  |
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares) |  | 131,000 |  |  |  |
Net income (loss) | 14,310 |  |  | 14,310 |  |
Balance at Oct. 31, 2018 | 436,242 | $ 73 | 258,126 | 398,846 | 1,572 | $ (222,375)
Balance (in shares) at Oct. 31, 2018 |  | 72,706,000 |  |  |  |
Treasury stock, shares at Oct. 31, 2018 |  |  |  |  |  | 18,167,000
Balance at Jul. 31, 2018 | 426,680 | $ 73 | 255,189 | 392,181 | 1,612 | $ (222,375)
Balance (in shares) at Jul. 31, 2018 |  | 72,551,000 |  |  |  |
Treasury stock, shares at Jul. 31, 2018 |  |  |  |  |  | 18,167,000
Proceeds from exercise of employee stock options | 76 |  | 76 |  |  |
Proceeds from exercise of employee stock options (in shares) |  | 16,000 |  |  |  |
Stock-based compensation | 1,962 |  | 1,962 |  |  |
Shares issued under employee stock purchase plan | 943 |  | 943 |  |  |
Shares issued under employee stock (in shares) |  | 108,000 |  |  |  |
Change in unrealized loss on interest rate swap, net of tax effect | (40) |  |  |  | (40) |
Issuance of common stock under restricted stock unit awards, net of shares surrendered | (44) |  | (44) |  |  |
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares) |  | 31,000 |  |  |  |
Net income (loss) | 6,665 |  |  | 6,665 |  |
Balance at Oct. 31, 2018 | 436,242 | $ 73 | 258,126 | 398,846 | 1,572 | $ (222,375)
Balance (in shares) at Oct. 31, 2018 |  | 72,706,000 |  |  |  |
Treasury stock, shares at Oct. 31, 2018 |  |  |  |  |  | 18,167,000
Balance at Apr. 30, 2019 | $ 444,444 | $ 73 | 263,180 | 402,946 | 620 | $ (222,375)
Balance (in shares) at Apr. 30, 2019 | 54,696,762 | 72,864,000 |  |  |  |
Treasury stock, shares at Apr. 30, 2019 | 18,166,862 |  |  |  |  | 18,167,000
Proceeds from exercise of employee stock options | $ 74 |  | 74 |  |  |
Proceeds from exercise of employee stock options (in shares) | 15,000 | 15,000 |  |  |  |
Stock-based compensation | $ 3,016 |  | 3,016 |  |  |
Shares issued under employee stock purchase plan | 862 |  | 862 |  |  |
Shares issued under employee stock (in shares) |  | 173,000 |  |  |  |
Change in unrealized loss on interest rate swap, net of tax effect | (481) |  |  |  | (481) |
Issuance of common stock under restricted stock unit awards, net of shares surrendered | (550) |  | (550) |  |  |
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares) |  | 174,000 |  |  |  |
Net income (loss) | (815) |  |  | (815) |  |
Balance at Oct. 31, 2019 | $ 446,550 | $ 73 | 266,582 | 402,131 | 139 | $ (222,375)
Balance (in shares) at Oct. 31, 2019 | 55,059,279 | 73,226,000 |  |  |  |
Treasury stock, shares at Oct. 31, 2019 | 18,166,862 |  |  |  |  | 18,167,000
Balance at Jul. 31, 2019 | $ 443,058 | $ 73 | 264,230 | 400,838 | 292 | $ (222,375)
Balance (in shares) at Jul. 31, 2019 |  | 72,988,000 |  |  |  |
Treasury stock, shares at Jul. 31, 2019 |  |  |  |  |  | 18,167,000
Proceeds from exercise of employee stock options | 74 |  | 74 |  |  |
Proceeds from exercise of employee stock options (in shares) |  | 15,000 |  |  |  |
Stock-based compensation | 1,428 |  | 1,428 |  |  |
Shares issued under employee stock purchase plan | 862 |  | 862 |  |  |
Shares issued under employee stock (in shares) |  | 173,000 |  |  |  |
Change in unrealized loss on interest rate swap, net of tax effect | (153) |  |  |  | (153) |
Issuance of common stock under restricted stock unit awards, net of shares surrendered | (12) |  | (12) |  |  |
Issuance of common stock under restricted stock unit awards, net of shares surrendered (in shares) |  | 50,000 |  |  |  |
Net income (loss) | 1,293 |  |  | 1,293 |  |
Balance at Oct. 31, 2019 | $ 446,550 | $ 73 | $ 266,582 | $ 402,131 | $ 139 | $ (222,375)
Balance (in shares) at Oct. 31, 2019 | 55,059,279 | 73,226,000 |  |  |  |
Treasury stock, shares at Oct. 31, 2019 | 18,166,862 |  |  |  |  | 18,167,000

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