Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	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]	Cumulative Effect, Period of Adoption, Adjustment [Member] Preferred Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [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 (Accounting Standards Update 2016-02 [Member]) at Mar. 31, 2019							$ 0	$ 0	$ 0	$ 0	$ 0	$ (2,019)
Balance at Mar. 31, 2019													$ 707	$ 3,039	$ 98,260	$ (75,740)	$ (18,285)	$ 409,504
Net earnings (loss)													0	0	0	0	0	1,103	$ 1,103
Cash dividends declared on preferred stock													0	0	0	0	0	(12)
Equity incentive program													0	0	25	0	0	0
Purchase treasury stock													0	0	0	(2,744)	0	0
Balance at Jun. 29, 2019													707	3,039	98,285	(78,484)	(18,285)	408,576	413,838
Balance at Mar. 31, 2020													681	3,041	98,384	(88,319)	(79,220)	459,797	394,364
Net earnings (loss)													0	0	0	0	0	20,706	20,706
Cash dividends declared on preferred stock													0	0	0	0	0	(12)
Equity incentive program													0	0	28	0	0	0
Purchase treasury stock																			0
Balance at Jun. 27, 2020													$ 681	$ 3,041	$ 98,412	$ (88,319)	$ (79,220)	$ 480,491	$ 415,086
Preferred stock, shares authorized (in shares)	200,000	1,400,000	35,355	500
Common stock, shares authorized (in shares)					20,000,000	10,000,000
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