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Consolidated Statements of Stockholders' Equity - USD ($) | Total | Common Stock [Member] | Paid-in Capital [Member] | Treasury Stock [Member] | Retained Earnings [Member]
--- | --- | --- | --- | --- | ---
Beginning balance at Mar. 31, 2015 | $ 127,923,000 | $ 3,000 | $ 123,440,000 | $ (360,278,000) | $ 364,758,000
Beginning balance, shares at Mar. 31, 2015 |  | 53,243,157 |  | (32,992,488) |
Stock issued under employee stock purchase plan | 371,000 |  | 371,000 |  |
Stock issued under employee stock purchase plan, shares |  | 10,975 |  |  |
Stock issued under stock option plan, net of shares repurchased | 3,749,000 |  | 3,749,000 |  |
Stock issued under stock option plan, net of shares repurchased, shares |  | 194,540 |  |  |
Stock-based compensation expense | 2,192,000 |  | 2,192,000 |  |
Income tax benefits from stock option exercises | 713,000 |  | 713,000 |  |
Purchase of treasury stock | $ (31,525,000) |  |  | $ (31,525,000) |
Purchase of treasury stock, shares | (893,771) |  |  | (893,771) |
Net income | $ 28,525,000 |  |  |  | 28,525,000
Ending balance at Mar. 31, 2016 | 131,948,000 | $ 3,000 | 130,465,000 | $ (391,803,000) | 393,283,000
Ending balance, shares at Mar. 31, 2016 |  | 53,448,672 |  | (33,886,259) |
Stock issued under employee stock purchase plan | 419,000 |  | 419,000 |  |
Stock issued under employee stock purchase plan, shares |  | 10,596 |  |  |
Stock issued under stock option plan, net of shares repurchased | 2,367,000 |  | 2,367,000 |  |
Stock issued under stock option plan, net of shares repurchased, shares |  | 109,799 |  |  |
Stock-based compensation expense | 2,432,000 |  | 2,432,000 |  |
Purchase of treasury stock | $ (27,999,000) |  |  | $ (27,999,000) |
Purchase of treasury stock, shares | (745,575) |  |  | (745,575) |
Net income | $ 29,479,000 |  |  |  | 29,479,000
Ending balance at Mar. 31, 2017 | 138,646,000 | $ 3,000 | 135,683,000 | $ (419,802,000) | 422,762,000
Ending balance, shares at Mar. 31, 2017 |  | 53,569,067 |  | (34,631,834) |
Stock issued under employee stock purchase plan | $ 458,000 |  | 458,000 |  |
Stock issued under employee stock purchase plan, shares | 2,469,843 | 8,976 |  |  |
Stock issued under stock option plan, net of shares repurchased | $ 3,426,000 |  | 3,426,000 |  |
Stock issued under stock option plan, net of shares repurchased, shares |  | 215,943 |  |  |
Stock-based compensation expense | 3,164,000 |  | 3,164,000 |  |
Purchase of treasury stock | $ (11,187,000) |  |  | $ (11,187,000) |
Purchase of treasury stock, shares | (249,245) |  |  | (249,245) |
Adjustment to deferred income taxes for prior year's stock options | $ 974,000 |  | 974,000 |  |
Net income | 35,695,000 |  |  |  | 35,695,000
Ending balance at Mar. 31, 2018 | $ 171,176,000 | $ 3,000 | $ 143,705,000 | $ (430,989,000) | $ 458,457,000
Ending balance, shares at Mar. 31, 2018 |  | 53,793,986 |  | (34,881,079) |

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