Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($)	Cumulative Preferred Stock [Member] Preferred Stock [Member]	Cumulative Convertible Preferred Stock [Member] Common Stock [Member]	Participating Convertible Preferred Stock [Member] Additional Paid-in Capital [Member]	Series 2003 Convertible Preferred Stock [Member] Treasury Stock [Member]	Common Class A [Member] Preferred Stock [Member]	Common Class A [Member] AOCI Attributable to Parent [Member]	Common Class A [Member]	Common Class B [Member] Common Stock [Member]	Common Class B [Member] Retained Earnings [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, 2018											$ 707,000	$ 3,038,000	$ 98,161,000	$ (69,556,000)	$ (25,067,000)	$ 403,780,000
Net earnings (loss)																(8,755,000)
Cash dividends paid on preferred stock																(12,000)
Equity incentive program													25,000
Change in pension, post retirement benefits, other (net of tax)															(51,000)
Balance at Jun. 30, 2018											707,000	3,038,000	98,186,000	(69,556,000)	(25,118,000)	395,013,000
Balance at Mar. 31, 2018											707,000	3,038,000	98,161,000	(69,556,000)	(25,067,000)	403,780,000
Net earnings (loss)																	$ 14,377,000
Balance at Dec. 29, 2018											707,000	3,038,000	98,236,000	(74,896,000)	(25,186,000)	418,134,000	420,033,000
Balance at Jun. 30, 2018											707,000	3,038,000	98,186,000	(69,556,000)	(25,118,000)	395,013,000
Net earnings (loss)																9,116,000
Equity incentive program													25,000
Purchase treasury stock														(1,579,000)
Change in pension, post retirement benefits, other (net of tax)															(51,000)
Balance at Sep. 29, 2018											707,000	3,038,000	98,211,000	(71,135,000)	(25,169,000)	404,129,000
Net earnings (loss)																14,016,000	14,016,000
Cash dividends paid on preferred stock																(11,000)
Equity incentive program													25,000
Purchase treasury stock														(3,761,000)
Change in pension, post retirement benefits, other (net of tax)															(17,000)
Balance at Dec. 29, 2018											707,000	3,038,000	98,236,000	(74,896,000)	(25,186,000)	418,134,000	420,033,000
Balance at Mar. 31, 2019											707,000	3,039,000	98,260,000	(75,740,000)	(18,285,000)	409,504,000	417,485,000
Net earnings (loss)																1,103,000
Cash dividends paid on preferred stock																(12,000)
Equity incentive program													25,000
Purchase treasury stock														(2,744,000)
Operating lease impairment adjustment upon the adoption of ASU 2016-02 "Leases" (net of tax)																(2,019,000)
Balance at Jun. 29, 2019											707,000	3,039,000	98,285,000	(78,484,000)	(18,285,000)	408,576,000
Balance at Mar. 31, 2019											707,000	3,039,000	98,260,000	(75,740,000)	(18,285,000)	409,504,000	417,485,000
Net earnings (loss)																	31,121,000
Purchase treasury stock							$ (7,571,000)			$ (3,883,000)
Balance at Dec. 28, 2019											703,000	3,040,000	98,338,000	(87,194,000)	(18,285,000)	438,583,000	435,185,000
Balance at Jun. 29, 2019											707,000	3,039,000	98,285,000	(78,484,000)	(18,285,000)	408,576,000
Net earnings (loss)																4,635,000
Equity incentive program													25,000
Purchase treasury stock														(5,836,000)
Preferred stock conversion											(4,000)	1,000	3,000
Balance at Sep. 28, 2019											703,000	3,040,000	98,313,000	(84,320,000)	(18,285,000)	413,211,000
Net earnings (loss)																25,383,000	25,383,000
Cash dividends paid on preferred stock																(11,000)
Equity incentive program													25,000
Purchase treasury stock														(2,874,000)
Balance at Dec. 28, 2019											$ 703,000	$ 3,040,000	$ 98,338,000	$ (87,194,000)	$ (18,285,000)	$ 438,583,000	$ 435,185,000
Shares authorized and designated: (in shares)	200,000	1,400,000	37,155	500
Common stock, shares authorized (in shares)					200,000			1,400,000
Preferred stock, shares outstanding (in shares)	200,000	807,240	37,155	500
Common stock, shares outstanding (in shares)						7,416,735			1,735,636