Consolidated Statements Of Changes in Shareholders' Equity - USD ($) $ in Thousands	Class C Convertible Preferred Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member]	Total
Balance beginning at Mar. 28, 2020	$ 33	$ 396	$ (108,729)	$ 229,774	$ (6,889)	$ 619,855	$ 734,440
Beginning balance, preferred shares at Mar. 28, 2020	22,000
Beginning balance, common shares at Mar. 28, 2020		39,645,000	6,360,000
Net income						15,833	15,833
Other comprehensive loss
Pension liability adjustment					(340)		(340)
Dividends declared
Preferred						(224)	(224)
Common						(14,651)	(14,651)
Dividend payable						(13)	(13)
Stock options and restricted stock		$ 1		(194)			(193)
Stock options and restricted stock, shares		22,000
Stock-based compensation				1,515			1,515
Balance ending at Sep. 26, 2020	$ 33	$ 397	$ (108,729)	231,095	(7,229)	620,800	736,367
Ending balance, preferred shares at Sep. 26, 2020	22,000	39,667,000
Ending balance, common shares at Sep. 26, 2020		39,667,000	6,360,000
Balance beginning at Jun. 27, 2020	$ 33	$ 396	$ (108,729)	230,683	(7,059)	615,396	730,720
Beginning balance, preferred shares at Jun. 27, 2020	22,000	39,646,000
Beginning balance, common shares at Jun. 27, 2020			6,360,000
Net income						12,846	12,846
Other comprehensive loss
Pension liability adjustment					(170)		(170)
Dividends declared
Preferred						(112)	(112)
Common						(7,328)	(7,328)
Dividend payable						(2)	(2)
Stock options and restricted stock		$ 1		(199)			(198)
Stock options and restricted stock, shares		21,000
Stock-based compensation				611			611
Balance ending at Sep. 26, 2020	$ 33	$ 397	$ (108,729)	231,095	(7,229)	620,800	736,367
Ending balance, preferred shares at Sep. 26, 2020	22,000	39,667,000
Ending balance, common shares at Sep. 26, 2020		39,667,000	6,360,000
Balance beginning at Mar. 27, 2021	$ 29	$ 398	$ (108,729)	238,244	(4,619)	624,361	$ 749,684
Beginning balance, preferred shares at Mar. 27, 2021	20,000						19,664
Beginning balance, common shares at Mar. 27, 2021		39,848,000	6,360,000
Net income						36,666	$ 36,666
Other comprehensive loss
Pension liability adjustment					(206)		(206)
Dividends declared
Preferred						(230)	(230)
Common						(16,761)	(16,761)
Dividend payable						(53)	(53)
Stock options and restricted stock		$ 1		1,945			1,946
Stock options and restricted stock, shares		52,000
Stock-based compensation				1,872			1,872
Balance ending at Sep. 25, 2021	$ 29	$ 399	$ (108,729)	242,061	(4,825)	643,983	$ 772,918
Ending balance, preferred shares at Sep. 25, 2021	20,000	39,900,000					19,664
Ending balance, common shares at Sep. 25, 2021		39,900,000	6,360,000
Balance beginning at Jun. 26, 2021	$ 29	$ 399	$ (108,729)	239,738	(4,722)	631,876	$ 758,591
Beginning balance, preferred shares at Jun. 26, 2021	20,000	39,865,000
Beginning balance, common shares at Jun. 26, 2021			6,360,000
Net income						20,985	20,985
Other comprehensive loss
Pension liability adjustment					(103)		(103)
Dividends declared
Preferred						(120)	(120)
Common						(8,719)	(8,719)
Dividend payable						(39)	(39)
Stock options and restricted stock				1,206			1,206
Stock options and restricted stock, shares		35,000
Stock-based compensation				1,117			1,117
Balance ending at Sep. 25, 2021	$ 29	$ 399	$ (108,729)	$ 242,061	$ (4,825)	$ 643,983	$ 772,918
Ending balance, preferred shares at Sep. 25, 2021	20,000	39,900,000					19,664
Ending balance, common shares at Sep. 25, 2021		39,900,000	6,360,000