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							20,644	20,644
Other comprehensive loss:
Pension liability adjustment						(77)		(77)
Dividends:
Preferred dividends							(102)	(102)
Common dividends							(6,572)	(6,572)
Dividend payable							(12)	(12)
Activity related to equity-based plans				$ (445)	1,223			778
Activity related to equity-based plans, shares			38,000	8,000
Stock-based compensation					1,084			1,084
Balance ending at Jun. 30, 2018		$ 33	$ 392	$ (107,008)	201,883	(4,325)	553,244	644,219
Ending balance, preferred shares at Jun. 30, 2018		22,000
Ending balance, common shares at Jun. 30, 2018			39,204,000	6,338,000
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							22,606	$ 22,606
Other comprehensive loss:
Pension liability adjustment						(89)		(89)
Dividends:
Preferred dividends	[1]						(112)	(112)
Common dividends	[1]						(7,305)	(7,305)
Dividend payable							(10)	(10)
Activity related to equity-based plans			$ 1		3,644			3,645
Activity related to equity-based plans, shares			71,000
Stock-based compensation					925			925
Balance ending at Jun. 29, 2019		$ 33	$ 396	$ (108,729)	$ 224,742	$ (4,625)	$ 606,771	$ 718,588
Ending balance, preferred shares at Jun. 29, 2019		22,000						21,802
Ending balance, common shares at Jun. 29, 2019			39,582,000	6,360,000

[1] First quarter fiscal year dividend payment of $0.22 and $0.20 per common share or common share equivalent paid on June 17, 2019 and June 14, 2018, respectively.