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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | COMMON STOCK | RETAINED EARNINGS | ACCUMULATED OTHER COMPREHENSIVE LOSS
--- | --- | --- | --- | ---
Balance at beginning of period (shares) at Apr. 30, 2018 |  | 17,503,922 |  |
Balance at beginning of period at Apr. 30, 2018 | $ 581,665 | $ 361,158 | $ 269,576 | $ (49,069)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 24,767 |  | 24,767 |
Other comprehensive loss, net of tax | 307 |  |  | 307
Stock-based compensation | 786 | $ 786 |  |
Exercise of stock-based compensation awards, net of amounts withheld for taxes (shares) |  | 43,048 |  |
Exercise of stock-based compensation awards, net of amounts withheld for taxes | (1,241) | $ (1,241) |  |
Employee benefit plan contributions (shares) |  | 41,408 |  |
Employee benefit plan contributions | 3,623 | $ 3,623 |  |
Balance at end of period (shares) at Jul. 31, 2018 |  | 17,588,378 |  |
Balance at end of period at Jul. 31, 2018 | 609,907 | $ 364,326 | 294,343 | (48,762)
Balance at beginning of period (shares) at Apr. 30, 2018 |  | 17,503,922 |  |
Balance at beginning of period at Apr. 30, 2018 | 581,665 | $ 361,158 | 269,576 | (49,069)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | $ 61,664 |  |  |
Stock repurchases (shares) | (628,714) |  |  |
Balance at end of period (shares) at Jan. 31, 2019 |  | 16,965,544 |  |
Balance at end of period at Jan. 31, 2019 | $ 607,972 | $ 353,887 | 302,233 | (48,148)
Balance at beginning of period (shares) at Jul. 31, 2018 |  | 17,588,378 |  |
Balance at beginning of period at Jul. 31, 2018 | 609,907 | $ 364,326 | 294,343 | (48,762)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 18,488 |  | 18,488 |
Other comprehensive loss, net of tax | 307 |  |  | 307
Stock-based compensation | 836 | $ 836 |  |
Exercise of stock-based compensation awards, net of amounts withheld for taxes (shares) |  | 5,880 |  |
Stock repurchases (shares) |  | (189,633) |  |
Stock repurchases | (13,199) | $ (3,602) | (9,597) |
Balance at end of period (shares) at Oct. 31, 2018 |  | 17,404,625 |  |
Balance at end of period at Oct. 31, 2018 | 616,339 | $ 361,560 | 303,234 | (48,455)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 18,409 |  | 18,409 |
Other comprehensive loss, net of tax | 307 |  |  | 307
Stock-based compensation | $ 668 | $ 668 |  |
Stock repurchases (shares) | (439,081) | (439,081) |  |
Stock repurchases | $ (27,751) | $ (8,341) | (19,410) |
Balance at end of period (shares) at Jan. 31, 2019 |  | 16,965,544 |  |
Balance at end of period at Jan. 31, 2019 | $ 607,972 | $ 353,887 | 302,233 | (48,148)
Balance at beginning of period (shares) at Apr. 30, 2019 | 16,849,026 | 16,849,026 |  |
Balance at beginning of period at Apr. 30, 2019 | $ 620,353 | $ 352,424 | 317,420 | (49,491)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 26,881 |  | 26,881 |
Other comprehensive loss, net of tax | 315 |  |  | 315
Stock-based compensation | 897 | $ 897 |  |
Exercise of stock-based compensation awards, net of amounts withheld for taxes (shares) |  | 20,923 |  |
Exercise of stock-based compensation awards, net of amounts withheld for taxes | (1,050) | $ (1,050) |  |
Employee benefit plan contributions (shares) |  | 45,721 |  |
Employee benefit plan contributions | 3,772 | $ 3,772 |  |
Balance at end of period (shares) at Jul. 31, 2019 |  | 16,915,670 |  |
Balance at end of period at Jul. 31, 2019 | $ 651,168 | $ 356,043 | 344,301 | (49,176)
Balance at beginning of period (shares) at Apr. 30, 2019 | 16,849,026 | 16,849,026 |  |
Balance at beginning of period at Apr. 30, 2019 | $ 620,353 | $ 352,424 | 317,420 | (49,491)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | $ 61,848 |  |  |
Stock repurchases (shares) | 0 |  |  |
Balance at end of period (shares) at Jan. 31, 2020 | 16,925,247 | 16,925,247 |  |
Balance at end of period at Jan. 31, 2020 | $ 689,285 | $ 358,562 | 379,268 | (48,545)
Balance at beginning of period (shares) at Jul. 31, 2019 |  | 16,915,670 |  |
Balance at beginning of period at Jul. 31, 2019 | 651,168 | $ 356,043 | 344,301 | (49,176)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 22,163 |  | 22,163 |
Other comprehensive loss, net of tax | 316 |  |  | 316
Stock-based compensation | 1,178 | $ 1,178 |  |
Exercise of stock-based compensation awards, net of amounts withheld for taxes (shares) |  | 5,877 |  |
Exercise of stock-based compensation awards, net of amounts withheld for taxes | 83 | $ 83 |  |
Balance at end of period (shares) at Oct. 31, 2019 |  | 16,921,547 |  |
Balance at end of period at Oct. 31, 2019 | 674,908 | $ 357,304 | 366,464 | (48,860)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income | 12,804 |  | 12,804 |
Other comprehensive loss, net of tax | 315 |  |  | 315
Stock-based compensation | 1,047 | $ 1,047 |  |
Exercise of stock-based compensation awards, net of amounts withheld for taxes (shares) |  | 3,700 |  |
Exercise of stock-based compensation awards, net of amounts withheld for taxes | $ 211 | $ 211 |  |
Stock repurchases (shares) | 0 |  |  |
Balance at end of period (shares) at Jan. 31, 2020 | 16,925,247 | 16,925,247 |  |
Balance at end of period at Jan. 31, 2020 | $ 689,285 | $ 358,562 | $ 379,268 | $ (48,545)

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