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Consolidated Statements of Stockholders' Equity - USD ($) | 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] | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Treasury Stock [Member] | AOCI Attributable to Parent [Member] | Retained Earnings [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Mar. 31, 2015 |  |  |  |  |  |  | $ 2,119,000 | $ 3,010,000 | $ 96,578,000 | $ (61,277,000) | $ (31,804,000) | $ 328,824,000 |
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  |  |  |  |  |  |  | 56,399,000 | $ 56,399,000
Cash dividends paid on preferred stock | $ (3,000) |  |  |  |  |  |  |  |  |  |  | (23,000) |
Equity incentive program |  |  |  |  |  |  |  |  | 33,000 |  |  |  |
Contribution of 401(k) match |  |  |  |  |  |  |  |  |  | 1,820,000 |  |  |
Purchase of treasury stock |  |  |  |  |  |  |  |  |  | (6,252,000) |  |  |
Preferred stock conversion |  |  |  |  |  |  | (775,000) | 13,000 | 762,000 |  |  |  |
Change in pension and postretirement benefits adjustment |  |  |  |  |  |  |  |  |  |  | 3,408,000 |  | (3,408,000)
Balance at Mar. 31, 2016 |  |  |  |  |  |  | 1,344,000 | 3,023,000 | 97,373,000 | (65,709,000) | (28,396,000) | 385,200,000 | 392,835,000
Preferred stock, shares outstanding (in shares) | 200,000 | 807,240 | 90,826 | 500 |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  | 7,918,069 | 1,894,599 |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  |  |  |  |  |  |  | 15,895,000 | 15,895,000
Cash dividends paid on preferred stock | $ (3,000) |  |  |  |  |  |  |  |  |  |  | (23,000) |
Equity incentive program |  |  |  |  |  |  |  |  | 66,000 |  |  |  |
Contribution of 401(k) match |  |  |  |  |  |  |  |  |  | 2,017,000 |  |  |
Purchase of treasury stock |  |  |  |  |  |  |  |  |  | (2,807,000) |  |  |
Preferred stock conversion |  |  |  |  |  |  | (20,000) | 1,000 | 19,000 |  |  |  |
Change in pension and postretirement benefits adjustment |  |  |  |  |  |  |  |  |  |  | 17,221,000 |  | (17,221,000)
Balance at Mar. 31, 2017 |  |  |  |  |  |  | 1,324,000 | 3,024,000 | 97,458,000 | (66,499,000) | (11,175,000) | 401,072,000 | 425,204,000
Balance at Jul. 02, 2016 |  |  |  |  |  |  |  |  |  |  |  |  | 393,342,000
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  |  |  |  |  |  |  |  | 6,821,000
Balance at Oct. 01, 2016 |  |  |  |  |  |  |  |  |  |  |  |  | 399,617,000
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  |  |  |  |  |  |  |  | 7,789,000
Balance at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  | 406,610,000
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  |  |  |  |  |  |  |  | 320,000
Balance at Mar. 31, 2017 |  |  |  |  |  |  | 1,324,000 | 3,024,000 | 97,458,000 | (66,499,000) | (11,175,000) | 401,072,000 | 425,204,000
Preferred stock, shares outstanding (in shares) | 200,000 | 807,240 | 89,251 | 500 |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  | 7,910,508 | 1,884,839 |  |  |  |  |  |  |
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  |  |  |  |  |  |  |  | (980,000)
Balance at Jul. 01, 2017 |  |  |  |  |  |  |  |  |  |  |  |  | 424,330,000
Balance at Mar. 31, 2017 |  |  |  |  |  |  | 1,324,000 | 3,024,000 | 97,458,000 | (66,499,000) | (11,175,000) | 401,072,000 | 425,204,000
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  |  |  |  |  |  |  | (13,811,000) | (13,811,000)
Cash dividends paid on preferred stock | $ (3,000) |  |  |  |  |  |  |  |  |  |  | (23,000) | (23,000)
Equity incentive program |  |  |  |  |  |  |  |  | 100,000 |  |  |  |
Contribution of 401(k) match |  |  |  |  |  |  |  |  |  | 1,501,000 |  |  |
Purchase of treasury stock |  |  |  |  | $ (4,600,000) | $ (7,000) |  |  |  | (4,558,000) |  |  |
Preferred stock conversion |  |  |  |  |  |  | (617,000) | 14,000 | 603,000 |  |  |  |
Change in pension and postretirement benefits adjustment |  |  |  |  |  |  |  |  |  |  | (11,483,000) |  | 11,483,000
Reclassification of certain tax effects | Accounting Standards Update 2018-02 [Member] |  |  |  |  |  |  |  |  |  |  | (2,409,000) | 2,409,000 |
Balance at Mar. 31, 2018 |  |  |  |  |  |  | 707,000 | 3,038,000 | 98,161,000 | (69,556,000) | (25,067,000) | 389,647,000 | 396,930,000
Balance at Jul. 01, 2017 |  |  |  |  |  |  |  |  |  |  |  |  | 424,330,000
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  |  |  |  |  |  |  |  | (2,958,000)
Balance at Sep. 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  | 418,744,000
Net Income (Loss) Attributable to Parent, Total |  |  |  |  |  |  |  |  |  |  |  |  | 4,377,000
Balance at Dec. 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |  | 422,439,000
Reclassification of certain tax effects |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000
Balance at Mar. 31, 2018 |  |  |  |  |  |  | $ 707,000 | $ 3,038,000 | $ 98,161,000 | $ (69,556,000) | $ (25,067,000) | $ 389,647,000 | $ 396,930,000
Preferred stock, shares authorized (in shares) | 200,000 | 1,400,000 | 37,529 | 500 |  |  |  |  |  |  |  |  |
Common stock, shares authorized (in shares) |  |  |  |  | 20,000,000 | 10,000,000 |  |  |  |  |  |  |
Preferred stock, shares outstanding (in shares) | 200,000 | 807,240 | 37,529 | 500 |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  |  |  |  | 7,860,033 | 1,884,439 |  |  |  |  |  |  |
Preferred stock, stock amount | $ 50,000 | $ 202,000 | $ 447,000 | $ 8,000 |  |  |  |  |  |  |  |  |
Common stock, stock amount |  |  |  |  | $ 2,534,000 | $ 504,000 |  |  |  |  |  |  |

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