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. 31, 2018		$ 33	$ 392	$ (106,563)	$ 199,576	$ (4,248)	$ 539,286	$ 628,476
Beginning balance, preferred shares at Mar. 31, 2018		22,000
Beginning balance, common shares at Mar. 31, 2018			39,166,000	6,330,000
Net income							62,936	62,936
Other comprehensive loss:
Pension liability adjustment						(227)		(227)
Cash dividends:
Preferred dividends							(306)	(306)
Common dividends	[1]						(19,778)	(19,778)
Dividend payable							(37)	(37)
Activity related to equity-based plans			$ 3	$ (2,166)	14,083			11,920
Activity related to equity-based plans, shares			293,000	30,000
Stock-based compensation					3,150			3,150
Balance ending at Dec. 29, 2018		$ 33	$ 395	$ (108,729)	216,809	(4,475)	582,101	686,134
Ending balance, preferred shares at Dec. 29, 2018		22,000
Ending balance, common shares at Dec. 29, 2018			39,459,000	6,360,000
Balance beginning at Sep. 29, 2018		$ 33	$ 393	$ (107,523)	206,533	(4,399)	568,304	663,341
Beginning balance, preferred shares at Sep. 29, 2018		22,000
Beginning balance, common shares at Sep. 29, 2018			39,300,000	6,345,000
Net income							20,531	20,531
Other comprehensive loss:
Pension liability adjustment						(76)		(76)
Cash dividends:
Preferred dividends							(102)	(102)
Common dividends	[1]						(6,620)	(6,620)
Dividend payable							(12)	(12)
Activity related to equity-based plans			$ 2	$ (1,206)	9,191			7,987
Activity related to equity-based plans, shares			159,000	15,000
Stock-based compensation					1,085			1,085
Balance ending at Dec. 29, 2018		$ 33	$ 395	$ (108,729)	216,809	(4,475)	582,101	686,134
Ending balance, preferred shares at Dec. 29, 2018		22,000
Ending balance, common shares at Dec. 29, 2018			39,459,000	6,360,000
Balance beginning at Mar. 30, 2019		$ 33	$ 395	$ (108,729)	220,173	(4,536)	592,174	699,510
Accounting change - cumulative effect at Mar. 30, 2019							(582)	(582)
Adjusted balance at Mar. 30, 2019		$ 33	$ 395	$ (108,729)	220,173	(4,536)	591,592	$ 698,928
Beginning balance, preferred shares at Mar. 30, 2019		22,000						21,802
Beginning balance, common shares at Mar. 30, 2019			39,511,000	6,360,000
Net income							61,800	$ 61,800
Other comprehensive loss:
Pension liability adjustment						(266)		(266)
Cash dividends:
Preferred dividends							(337)	(337)
Common dividends	[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						21,802
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 dividends							(112)	(112)
Common dividends	[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						21,802
Ending balance, common shares at Dec. 28, 2019			39,640,000	6,360,000

[1] First, second and third quarter fiscal year 2020 dividend payments of $0.22 per common share or common share equivalent paid on June 17, 2019, September 9, 2019 and December 24, 2019, respectively. First, second and third quarter fiscal year 2019 dividend payments of $0.20 per common share or common share equivalent paid on June 14, 2018, September 6, 2018 and December 21, 2018, respectively.