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						22,516	22,516
Other comprehensive loss
Pension liability adjustment					(510)		(510)
Dividends declared
Preferred						(337)	(337)
Common						(21,978)	(21,978)
Dividend payable						(23)	(23)
Stock options and restricted stock		$ 1		(194)			(193)
Stock options and restricted stock, shares		22,000
Stock-based compensation				2,128			2,128
Balance ending at Dec. 26, 2020	$ 33	$ 397	$ (108,729)	231,708	(7,399)	620,033	736,043
Ending balance, preferred shares at Dec. 26, 2020	22,000
Ending balance, common shares at Dec. 26, 2020		39,667,000	6,360,000
Balance beginning at Sep. 26, 2020	$ 33	$ 397	$ (108,729)	231,095	(7,229)	620,800	736,367
Beginning balance, preferred shares at Sep. 26, 2020	22,000
Beginning balance, common shares at Sep. 26, 2020		39,667,000	6,360,000
Net income						6,683	6,683
Other comprehensive loss
Pension liability adjustment					(170)		(170)
Dividends declared
Preferred						(112)	(112)
Common						(7,328)	(7,328)
Dividend payable						(10)	(10)
Stock-based compensation				613			613
Balance ending at Dec. 26, 2020	$ 33	$ 397	$ (108,729)	231,708	(7,399)	620,033	736,043
Ending balance, preferred shares at Dec. 26, 2020	22,000
Ending balance, common shares at Dec. 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						52,953	$ 52,953
Other comprehensive loss
Pension liability adjustment					(308)		(308)
Dividends declared
Preferred						(350)	(350)
Common						(25,483)	(25,483)
Dividend payable						(91)	(91)
Stock options and restricted stock		$ 1		1,975			1,976
Stock options and restricted stock, shares		58,000
Stock-based compensation				3,130			3,130
Balance ending at Dec. 25, 2021	$ 29	$ 399	$ (108,729)	243,349	(4,927)	651,390	$ 781,511
Ending balance, preferred shares at Dec. 25, 2021	20,000						19,664
Ending balance, common shares at Dec. 25, 2021		39,906,000	6,360,000
Balance beginning at Sep. 25, 2021	$ 29	$ 399	$ (108,729)	242,061	(4,825)	643,983	$ 772,918
Beginning balance, preferred shares at Sep. 25, 2021	20,000
Beginning balance, common shares at Sep. 25, 2021		39,900,000	6,360,000
Net income						16,287	16,287
Other comprehensive loss
Pension liability adjustment					(102)		(102)
Dividends declared
Preferred						(120)	(120)
Common						(8,722)	(8,722)
Dividend payable						(38)	(38)
Stock options and restricted stock				30			30
Stock options and restricted stock, shares		6,000
Stock-based compensation				1,258			1,258
Balance ending at Dec. 25, 2021	$ 29	$ 399	$ (108,729)	$ 243,349	$ (4,927)	$ 651,390	$ 781,511
Ending balance, preferred shares at Dec. 25, 2021	20,000						19,664
Ending balance, common shares at Dec. 25, 2021		39,906,000	6,360,000