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Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - 9 months ended Dec. 30, 2017 - 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, 2017             $ 1,324,000 $ 3,024,000 $ 97,458,000 $ (66,499,000) $ (11,175,000) $ 410,129,000 $ 434,261,000
Net earnings             5,776,000 5,776,000
Cash dividends on preferred stock             (23,000) (17,000)
Equity incentive program             75,000  
Preferred stock conversion             (617,000) 14,000 603,000  
Purchase treasury stock         $ (3,441,000)   (3,442,000)  
Change in pension, post retirement benefits and other (net of tax of $30 and $93)             152,000 152,000
Balance at Dec. 30, 2017             $ 707,000 $ 3,038,000 $ 98,136,000 $ (69,941,000) $ (11,023,000) $ 415,882,000 $ 436,799,000
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)         7,854,451 1,884,439