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Consolidated Statements of Stockholders' Equity - USD ($) | Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] | Preferred Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Preferred Stock [Member] | Common Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | Treasury Stock [Member] | AOCI Attributable to Parent [Member] Cumulative Effect, Period of Adoption, Adjustment [Member] | AOCI Attributable to Parent [Member] | Cumulative Preferred Stock [Member] | Cumulative Convertible Preferred Stock [Member] | Participating Convertible Preferred Stock [Member] | Series 2003 Convertible Preferred Stock [Member] | Common Class A [Member] | Common Class B [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (Accounting Standards Update 2016-02 [Member]) at Mar. 31, 2019 | $ (2,019,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at Mar. 31, 2019 |  | $ 409,504,000 |  | $ 707,000 |  | $ 3,039,000 |  | $ 98,260,000 |  | $ (75,740,000) |  | $ (18,285,000) |  |  |  |  |  |  |
Net earnings |  | 52,335,000 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  | $ 52,335,000
Cash dividends paid on preferred stock |  | (23,000) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 | $ (3,000) |  |  |  |  |  |
Equity incentive program |  | 0 |  | 0 |  | 0 |  | 100,000 |  | 0 |  | 0 |  |  |  |  |  |  |
Contribution of 401(k) match |  | 0 |  | 0 |  | 0 |  | 0 |  | 94,000 |  | 0 |  |  |  |  |  |  |
Purchase of treasury stock |  | 0 |  | 0 |  | 0 |  | 0 |  | (12,673,000) |  | 0 |  |  |  |  |  |  |
Preferred stock conversion |  | 0 |  | (26,000) |  | 2,000 |  | 24,000 |  | 0 |  | 0 |  |  |  |  |  |  |
Change in pension and postretirement benefits adjustment (net of tax) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | (60,935,000) |  |  |  |  |  |  |
Balance at Mar. 31, 2020 |  | 459,797,000 |  | 681,000 |  | 3,041,000 |  | 98,384,000 |  | (88,319,000) |  | (79,220,000) |  |  |  |  |  |  | 394,364,000
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 807,240 | 35,355 | 500 |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,383,993 | 1,733,902 |
Net earnings |  | 126,100,000 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  |  |  |  |  |  | 126,100,000
Cash dividends paid on preferred stock |  | (23,000) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 | $ (3,000) |  |  |  |  |  | (23,000)
Equity incentive program |  | 0 |  | 0 |  | 0 |  | 100,000 |  | 0 |  | 0 |  |  |  |  |  |  |
Contribution of 401(k) match |  | 0 |  | 0 |  | 0 |  | 0 |  | 1,479,000 |  | 0 |  |  |  |  |  |  |
Purchase of treasury stock |  | 0 |  | 0 |  | 0 |  | 0 |  | (4,358,000) |  | 0 |  |  |  |  | $ (4,400,000) |  |
Preferred stock conversion |  | 0 |  | (18,000) |  | 0 |  | 18,000 |  | 0 |  | 0 |  |  |  |  |  |  |
Change in pension and postretirement benefits adjustment (net of tax) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 60,153,000 |  |  |  |  |  |  |
Balance at Mar. 31, 2021 |  | $ 585,874,000 |  | $ 663,000 |  | $ 3,041,000 |  | $ 98,502,000 |  | $ (91,198,000) |  | $ (19,067,000) |  |  |  |  |  |  | $ 577,815,000
Preferred stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 1,400,000 | 33,855 | 500 |  |  |
Common stock, shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,000,000 | 10,000,000 |
Preferred stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 807,240 | 33,855 | 500 |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,353,545 | 1,709,638 |
Preferred stock, stock amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000 | $ 202,000 | $ 403,000 | $ 8,000 |  |  |
Common stock, stock amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,545,000 | $ 496,000 |

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