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Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Treasury Stock | Accumulated Other Comprehensive Income (Loss) | Retained Earnings
--- | --- | --- | --- | --- | --- | ---
Common stock, beginning balance (in shares) at Mar. 31, 2019 |  | 53,670,000 |  |  |  |
Equity, beginning balance at Mar. 31, 2019 | $ 1,095,831 | $ 536 | $ 479,150 | $ (59,928) | $ (25,747) | $ 701,820
Treasury stock, beginning balance (in shares) at Mar. 31, 2019 |  |  |  | 1,871,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation | $ 5,682 |  | 5,682 |  |  |
Exercise of stock options (in shares) | 36,000.0 | 36,000 |  |  |  |
Exercise of stock options | $ 1,007 |  | 1,007 |  |  |
Issuance of shares related to restricted stock (in shares) |  | 73,000 |  |  |  |
Issuance of shares related to restricted stock | 0 | $ 1 | (1) |  |  |
Treasury share repurchases (in shares) |  |  |  | 1,654,000 |  |
Treasury share repurchases | (50,950) |  |  | $ (50,950) |  |
Net income | 105,235 |  |  |  |  | 105,235
Comprehensive income (loss) | (311) |  |  |  | (311) |
Common stock, ending balance (in shares) at Dec. 31, 2019 |  | 53,779,000 |  |  |  |
Equity, ending balance at Dec. 31, 2019 | 1,156,494 | $ 537 | 485,838 | $ (110,878) | (26,058) | 807,055
Treasury stock, ending balance (in shares) at Dec. 31, 2019 |  |  |  | 3,525,000 |  |
Common stock, beginning balance (in shares) at Sep. 30, 2019 |  | 53,755,000 |  |  |  |
Equity, beginning balance at Sep. 30, 2019 | 1,112,790 | $ 537 | 483,595 | $ (110,784) | (29,555) | 768,997
Treasury stock, beginning balance (in shares) at Sep. 30, 2019 |  |  |  | 3,523,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation | 1,780 |  | 1,780 |  |  |
Exercise of stock options (in shares) |  | 18,000 |  |  |  |
Exercise of stock options | 463 |  | 463 |  |  |
Issuance of shares related to restricted stock (in shares) |  | 6,000 |  |  |  |
Issuance of shares related to restricted stock | 0 |  |  |  |  |
Treasury share repurchases (in shares) |  |  |  | 2,000 |  |
Treasury share repurchases | (94) |  |  | $ (94) |  |
Net income | 38,058 |  |  |  |  | 38,058
Comprehensive income (loss) | 3,497 |  |  |  | 3,497 |
Common stock, ending balance (in shares) at Dec. 31, 2019 |  | 53,779,000 |  |  |  |
Equity, ending balance at Dec. 31, 2019 | 1,156,494 | $ 537 | 485,838 | $ (110,878) | (26,058) | 807,055
Treasury stock, ending balance (in shares) at Dec. 31, 2019 |  |  |  | 3,525,000 |  |
Common stock, beginning balance (in shares) at Mar. 31, 2020 |  | 53,805,000 |  |  |  |
Equity, beginning balance at Mar. 31, 2020 | $ 1,170,971 | $ 538 | 488,116 | $ (117,623) | (44,161) | 844,101
Treasury stock, beginning balance (in shares) at Mar. 31, 2020 | 3,719,000 |  |  | 3,719,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation | $ 5,944 |  | 5,944 |  |  |
Exercise of stock options (in shares) | 65,800 | 66,000 |  |  |  |
Exercise of stock options | $ 1,324 |  | 1,324 |  |  |
Issuance of shares related to restricted stock (in shares) |  | 74,000 |  |  |  |
Issuance of shares related to restricted stock | 0 | $ 1 | (1) |  |  |
Treasury share repurchases (in shares) |  |  |  | 314,000 |  |
Treasury share repurchases | (11,116) |  |  | $ (11,116) |  |
Net income | 129,168 |  |  |  |  | 129,168
Comprehensive income (loss) | 26,930 |  |  |  | 26,930 |
Common stock, ending balance (in shares) at Dec. 31, 2020 |  | 53,945,000 |  |  |  |
Equity, ending balance at Dec. 31, 2020 | $ 1,323,221 | $ 539 | 495,383 | $ (128,739) | (17,231) | 973,269
Treasury stock, ending balance (in shares) at Dec. 31, 2020 | 4,033,000 |  |  | 4,033,000 |  |
Common stock, beginning balance (in shares) at Sep. 30, 2020 |  | 53,941,000 |  |  |  |
Equity, beginning balance at Sep. 30, 2020 | $ 1,278,217 | $ 539 | 493,756 | $ (119,862) | (28,612) | 932,396
Treasury stock, beginning balance (in shares) at Sep. 30, 2020 |  |  |  | 3,779,000 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation | 1,588 |  | 1,588 |  |  |
Exercise of stock options (in shares) |  | 4,000 |  |  |  |
Exercise of stock options | 39 |  | 39 |  |  |
Treasury share repurchases (in shares) |  |  |  | 254,000 |  |
Treasury share repurchases | (8,877) |  |  | $ (8,877) |  |
Net income | 40,873 |  |  |  |  | 40,873
Comprehensive income (loss) | 11,381 |  |  |  | 11,381 |
Common stock, ending balance (in shares) at Dec. 31, 2020 |  | 53,945,000 |  |  |  |
Equity, ending balance at Dec. 31, 2020 | $ 1,323,221 | $ 539 | $ 495,383 | $ (128,739) | $ (17,231) | $ 973,269
Treasury stock, ending balance (in shares) at Dec. 31, 2020 | 4,033,000 |  |  | 4,033,000 |  |

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