Consolidated Statements of Stockholders' Equity - USD ($) |
Preferred Stock [Member]
Cumulative Preferred Stock [Member]
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Preferred Stock [Member]
Cumulative Convertible Preferred Stock [Member]
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Preferred Stock [Member]
Participating Convertible Preferred Stock [Member]
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Preferred Stock [Member] |
Common Stock [Member]
Common Class A [Member]
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Common Stock [Member]
Common Class B [Member]
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Common Stock [Member] |
Additional Paid-in Capital [Member] |
Treasury Stock, Common [Member] |
AOCI Attributable to Parent [Member] |
Retained Earnings [Member] |
Cumulative Preferred Stock [Member] |
Cumulative Convertible Preferred Stock [Member] |
Participating Convertible Preferred Stock [Member] |
Common Class A [Member] |
Common Class B [Member] |
Total |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Balance at Mar. 31, 2023 | $ 351,000 | $ 3,049,000 | $ 99,152,000 | $ (168,573,000) | $ (20,488,000) | $ 641,259,000 | $ 554,750,000 | ||||||||||
| Net earnings | 0 | 0 | 0 | 0 | 0 | 63,318,000 | 63,318,000 | ||||||||||
| Cash dividends declared on preferred stock | 0 | 0 | 0 | 0 | 0 | (23,000) | (23,000) | ||||||||||
| Equity incentive program | 0 | 1,000 | 245,000 | 0 | 0 | 0 | 246,000 | ||||||||||
| Stock issued for profit sharing plan | 0 | 0 | 71,000 | 0 | 0 | 0 | 71,000 | ||||||||||
| Contribution of 401(k) match | 0 | 0 | 957,000 | 1,496,000 | 0 | 0 | 2,453,000 | ||||||||||
| Purchase treasury stock | 0 | 0 | 0 | (33,030,000) | 0 | 0 | (33,030,000) | ||||||||||
| Change in pension and postretirement benefits, net of tax expense (benefit) of $7,050, $5,772 and ($1,628), respectively | 0 | 0 | 0 | 0 | (4,892,000) | 0 | (4,892,000) | ||||||||||
| Balance at Mar. 31, 2024 | 351,000 | 3,050,000 | 100,425,000 | (200,107,000) | (25,380,000) | 704,554,000 | 582,893,000 | ||||||||||
| Preferred stock, shares outstanding (in shares) | 200,000 | 807,240 | 8,292 | ||||||||||||||
| Common stock, shares outstanding (in shares) | 5,400,429 | 1,659,411 | |||||||||||||||
| Net earnings | 0 | 0 | 0 | 0 | 0 | 41,224,000 | 41,224,000 | ||||||||||
| Cash dividends declared on preferred stock | 0 | 0 | 0 | 0 | 0 | (23,000) | $ (3,000) | (23,000) | |||||||||
| Equity incentive program | 0 | 1,000 | 174,000 | 0 | 0 | 0 | 175,000 | ||||||||||
| Stock issued for profit sharing plan | 0 | 0 | 6,000 | 0 | 0 | 0 | 6,000 | ||||||||||
| Contribution of 401(k) match | 0 | 0 | 1,766,000 | 1,029,000 | 0 | 0 | 2,795,000 | ||||||||||
| Purchase treasury stock | 0 | 0 | 0 | (11,591,000) | 0 | 0 | (11,591,000) | ||||||||||
| Change in pension and postretirement benefits, net of tax expense (benefit) of $7,050, $5,772 and ($1,628), respectively | 0 | 0 | 0 | 0 | 17,544,000 | 0 | 17,544,000 | ||||||||||
| Preferred stock conversion | (5,000) | 0 | 5,000 | 0 | 0 | 0 | 0 | ||||||||||
| Balance at Mar. 31, 2025 | 346,000 | 3,051,000 | 102,376,000 | (210,669,000) | (7,836,000) | 745,755,000 | 633,023,000 | ||||||||||
| Preferred stock, shares outstanding (in shares) | 200,000 | 807,240 | 7,891 | ||||||||||||||
| Common stock, shares outstanding (in shares) | 5,342,172 | 1,562,163 | |||||||||||||||
| Net earnings | 0 | 0 | 0 | 0 | 0 | 114,674,000 | 114,674,000 | ||||||||||
| Cash dividends declared on preferred stock | 0 | 0 | 0 | 0 | 0 | (23,000) | $ (3,000) | (23,181) | |||||||||
| Equity incentive program | 0 | 1,000 | 246,000 | 0 | 0 | 0 | 247,000 | ||||||||||
| Stock issued for profit sharing plan | 0 | 0 | 3,000 | 0 | 0 | 0 | 3,000 | ||||||||||
| Contribution of 401(k) match | 0 | 0 | 2,502,000 | 689,000 | 0 | 0 | 3,191,000 | ||||||||||
| Purchase treasury stock | 0 | 0 | 0 | (16,094,000) | 0 | 0 | $ (16,100,000) | (16,094,000) | |||||||||
| Change in pension and postretirement benefits, net of tax expense (benefit) of $7,050, $5,772 and ($1,628), respectively | 0 | 0 | 0 | 0 | 21,209,000 | 0 | 21,209,000 | ||||||||||
| Preferred stock conversion | (15,000) | 0 | 15,000 | 0 | 0 | 0 | 0 | ||||||||||
| Balance at Mar. 31, 2026 | $ 50,000 | $ 202,000 | $ 79,000 | $ 331,000 | $ 2,593,000 | $ 459,000 | $ 3,052,000 | $ 105,142,000 | $ (226,074,000) | $ 13,373,000 | $ 860,406,000 | $ 756,230,000 | |||||
| Preferred stock, shares authorized (in shares) | 200,000 | 1,400,000 | 6,602 | ||||||||||||||
| Common stock, shares authorized (in shares) | 20,000,000 | 10,000,000 | |||||||||||||||
| Preferred stock, shares outstanding (in shares) | 200,000 | 807,240 | 6,602 | ||||||||||||||
| Common stock, shares outstanding (in shares) | 5,222,138 | 1,557,926 |
| X | ||||||||||
- Definition Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition The maximum number of common shares permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Amount, after tax and reclassification adjustment, of (increase) decrease in accumulated other comprehensive income for defined benefit plan, attributable to parent. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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| X | ||||||||||
- Definition The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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| X | ||||||||||
- Definition Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition The gross value of stock issued during the period upon the conversion of convertible securities. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Value of shares issued during the period to an employee benefit plan, such as a defined contribution or defined benefit plan. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Value, after forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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| X | ||||||||||
- Definition Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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