Consolidated Statements Of Shareholders' Equity (USD $) In Thousands, unless otherwise specified	Total	Class B Common Stock	Common Stock	Common Stock	Class B Common Stock	Capital in Excess of Par	Retained Earnings	Retained Earnings Class B Common Stock	Retained Earnings Common Stock	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning Balance at May. 28, 2009	$ 327,440			$ 22,330	$ 8,860	$ 47,649	$ 273,637			$ (2,781)	$ (22,255)
Cash dividends:
Common Stock, Dividend		(2,737)	(7,146)					(2,737)	(7,146)
Exercise of stock options	340					(209)					549
Purchase of treasury stock	(769)										(769)
Savings and profit-sharing contribution	748					(160)					908
Reissuance of treasury stock	237					(67)					304
Issuance of non-vested stock						(161)					161
Share-based compensation	1,607					1,607
Other	5					5
Conversions of Class B Common Stock				5	(5)
Comprehensive income	16,071						16,115			(44)
Ending Balance at May. 27, 2010	335,796			22,335	8,855	48,664	279,869			(2,825)	(21,102)
Cash dividends:
Common Stock, Dividend		(2,733)	(7,077)					(2,733)	(7,077)
Exercise of stock options	1,048					(486)					1,534
Purchase of treasury stock	(4,220)										(4,220)
Savings and profit-sharing contribution	755					(320)					1,075
Reissuance of treasury stock	232					(53)					285
Issuance of non-vested stock						(229)					229
Share-based compensation	1,795					1,795
Other	66					66
Conversions of Class B Common Stock				21	(21)
Comprehensive income	13,818						13,558			260
Ending Balance at May. 26, 2011	339,480			22,356	8,834	49,437	283,617			(2,565)	(22,199)
Cash dividends:
Common Stock, Dividend		(2,729)	(6,978)					(2,729)	(6,978)
Exercise of stock options	1,284					(185)					1,469
Purchase of treasury stock	(11,433)										(11,433)
Savings and profit-sharing contribution	738					(117)					855
Reissuance of treasury stock	244					(55)					299
Issuance of non-vested stock						(267)					267
Share-based compensation	2,010					2,010
Other	13					13
Conversions of Class B Common Stock				16	(16)
Comprehensive income	21,160						22,734			(1,574)
Ending Balance at May. 31, 2012	$ 343,789			$ 22,372	$ 8,818	$ 50,836	$ 296,644			$ (4,139)	$ (30,742)