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Consolidated Statements of Changes in Stockholders' Equity and Comprehensive Income - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive (Loss) Income | Retained Earnings (Accumulated Deficit)
--- | --- | --- | --- | --- | --- | ---
Balances at Mar. 31, 2014 | $ 563,360 | $ 520 | $ 414,387 | $ (1,431) | $ 739 | $ 149,145
Common stock (in shares) at Mar. 31, 2014 |  | 52,021,000 |  |  |  |
Treasury stock (in shares) at Mar. 31, 2014 |  |  |  | 206,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation | 6,918 |  | 6,918 |  |  |
Exercise of stock options | $ 3,954 | $ 4 | 3,950 |  |  |
Exercise of stock options (in shares) | 386,300 | 387,000 |  |  |  |
Preferred share rights | $ 0 |  |  |  |  | 0
Issuance of shares related to restricted stock |  | $ 1 | (1) |  |  |
Issuance of shares related to restricted stock (in shares) |  | 154,000 |  |  |  |
Treasury share repurchases | (2,047) |  |  | $ (2,047) |  |
Treasury share repurchases (in shares) |  |  |  | 60,000 |  |
Excess tax benefits from share-based awards | 1,330 |  | 1,330 |  |  |
Components of comprehensive income: |  |  |  |  |  |
Net income | 78,260 |  |  |  |  | 78,260
Unrecognized net loss on pension plans | 0 |  |  |  |  |
Translation adjustments | (24,151) |  |  |  | (24,151) |
Comprehensive income | 54,109 |  |  |  |  |
Balances at Mar. 31, 2015 | 627,624 | $ 525 | 426,584 | $ (3,478) | (23,412) | 227,405
Common stock (in shares) at Mar. 31, 2015 |  | 52,562,000 |  |  |  |
Treasury stock (in shares) at Mar. 31, 2015 |  |  |  | 266,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation | 9,954 |  | 9,954 |  |  |
Exercise of stock options | $ 6,688 | $ 3 | 6,685 |  |  |
Exercise of stock options (in shares) | 348,000 | 348,000 |  |  |  |
Issuance of shares related to restricted stock | $ 1 | $ 2 | (1) |  |  |
Issuance of shares related to restricted stock (in shares) |  | 156,000 |  |  |  |
Treasury share repurchases | (1,685) |  |  | $ (1,685) |  |
Treasury share repurchases (in shares) |  |  |  | 40,000 |  |
Excess tax benefits from share-based awards | 1,960 |  | 1,960 |  |  |
Components of comprehensive income: |  |  |  |  |  |
Net income | 99,907 |  |  |  |  | 99,907
Unrecognized net loss on pension plans | 0 |  |  |  |  |
Translation adjustments | (113) |  |  |  | (113) |
Comprehensive income | 99,794 |  |  |  |  |
Balances at Mar. 31, 2016 | $ 744,336 | $ 530 | 445,182 | $ (5,163) | (23,525) | 327,312
Common stock (in shares) at Mar. 31, 2016 |  | 53,066,000 |  |  |  |
Treasury stock (in shares) at Mar. 31, 2016 | 306,000 |  |  | 306,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation | $ 8,148 |  | 8,148 |  |  |
Exercise of stock options | $ 4,028 | $ 2 | 4,026 |  |  |
Exercise of stock options (in shares) | 126,800 | 127,000 |  |  |  |
Issuance of shares related to restricted stock | $ 0 | $ 1 | (1) |  |  |
Issuance of shares related to restricted stock (in shares) |  | 94,000 |  |  |  |
Treasury share repurchases | (1,431) |  |  | $ (1,431) |  |
Treasury share repurchases (in shares) |  |  |  | 26,000 |  |
Excess tax benefits from share-based awards | 900 |  | 900 |  |  |
Components of comprehensive income: |  |  |  |  |  |
Net income | 69,395 |  |  |  |  |
Unrecognized net loss on pension plans | (252) |  |  |  |  |
Translation adjustments | (2,575) |  |  |  |  |
Comprehensive income | 66,568 |  |  |  |  |
Balances at Mar. 31, 2017 | $ 822,549 | $ 533 | $ 458,255 | $ (6,594) | $ (26,352) | $ 396,707
Common stock (in shares) at Mar. 31, 2017 |  | 53,287,000 |  |  |  |
Treasury stock (in shares) at Mar. 31, 2017 | 332,000 |  |  | 332,000 |  |

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