Consolidated Statements Of Changes in Shareholders' Equity - USD ($) $ in Thousands		Class C Convertible Preferred Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Class C Convertible Preferred Stock [Member]	Common Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Common Stock [Member]	Treasury Stock [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Loss [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Accumulated Other Comprehensive Loss [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjustment [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Total
Balance beginning at Mar. 30, 2019		$ 33	$ 33	$ 395	$ 395	$ (108,729)	$ (108,729)	$ 220,173	$ 220,173	$ (4,536)	$ (4,536)	$ (582)	$ 591,592	$ 592,174	$ (582)	$ 698,928	$ 699,510
Beginning balance, preferred shares at Mar. 30, 2019		22,000	22,000
Beginning balance, common shares at Mar. 30, 2019				39,511,000	39,511,000	6,360,000	6,360,000
Net income														61,800			61,800
Other comprehensive loss:
Pension liability adjustment											(266)						(266)
Cash dividends:
Preferred	[1]													(337)			(337)
Common	[1]													(21,944)			(21,944)
Dividend payable														(34)			(34)
Activity related to equity-based plans					$ 1				5,589								5,590
Activity related to equity-based plans, shares					129,000
Stock-based compensation									2,855								2,855
Balance ending at Dec. 28, 2019			$ 33		$ 396		$ (108,729)		228,617		(4,802)			631,077			746,592
Ending balance, preferred shares at Dec. 28, 2019			22,000
Ending balance, common shares at Dec. 28, 2019					39,640,000		6,360,000
Balance beginning at Sep. 28, 2019			$ 33		$ 396		$ (108,729)		226,948		(4,713)			619,641			733,576
Beginning balance, preferred shares at Sep. 28, 2019			22,000
Beginning balance, common shares at Sep. 28, 2019					39,628,000		6,360,000
Net income														18,880			18,880
Other comprehensive loss:
Pension liability adjustment											(89)						(89)
Cash dividends:
Preferred	[1]													(112)			(112)
Common	[1]													(7,321)			(7,321)
Dividend payable														(11)			(11)
Activity related to equity-based plans									701								701
Activity related to equity-based plans, shares					12,000
Stock-based compensation									968								968
Balance ending at Dec. 28, 2019			$ 33		$ 396		$ (108,729)		228,617		(4,802)			631,077			746,592
Ending balance, preferred shares at Dec. 28, 2019			22,000
Ending balance, common shares at Dec. 28, 2019					39,640,000		6,360,000
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														21,802
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)
Cash dividends:
Preferred	[1]													(337)			(337)
Common	[1]													(21,978)			(21,978)
Dividend payable														(23)			(23)
Activity related to equity-based plans					$ 1				(194)								(193)
Activity related to equity-based plans, 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														21,802
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)
Cash dividends:
Preferred	[1]													(112)			(112)
Common	[1]													(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														21,802
Ending balance, common shares at Dec. 26, 2020					39,667,000		6,360,000

[1] Declared quarterly dividend of $0.22 per common share or common share equivalent paid in each of the first, second and third quarter of fiscal 2021 and fiscal 2020.