CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands, unless otherwise specified	Locker [Member] Noncontrolling interest in consolidated subsidiaries	Locker [Member]	DS SM [Member] Noncontrolling interest in consolidated subsidiaries	DS SM [Member]	Ag Sense LLC [Member] Noncontrolling interest in consolidated subsidiaries	Ag Sense LLC [Member]	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income (loss)	Treasury stock	Noncontrolling interest in consolidated subsidiaries	Total
Balance at Dec. 31, 2011							$ 27,900		$ 1,079,698	$ 64,052	$ (24,688)	$ 50,949	$ 1,197,911
Increase (Decrease) in Shareholders' Equity
Net earnings									234,072			4,844	238,916
Other comprehensive income (loss)										(20,114)		1,235	(18,879)
Cash dividends declared ($1.375, $0.975 and $0.855 per share for the period ended December 2014, 2013 and 2012, respectively)									(22,756)				(22,756)
Dividends to noncontrolling interests												(1,944)	(1,944)
Sale of partial ownership interest								(610)				2,014	1,404
Stock plan exercises; 97,974, 103,023 and 174,943 shares acquired for the period ended December 2014, 2013 and 2012, respectively											(21,259)		(21,259)
Stock options exercised; 194,627, 216,105 and 341,090 shares issued for the period ended December 2014, 2013 and 2012, respectively								(10,713)	9,515		23,025		21,827
Tax benefit from stock option exercises								5,494					5,494
Stock option expense								4,934					4,934
Stock awards; 22,010, 33,721 and 20,988 shares issued for the period ended December 2014, 2013 and 2012, respectively								895			467		1,362
Balance at Dec. 29, 2012							27,900		1,300,529	43,938	(22,455)	57,098	1,407,010
Increase (Decrease) in Shareholders' Equity
Net earnings									278,489			1,971	280,460
Other comprehensive income (loss)										(91,623)		(7,204)	(98,827)
Cash dividends declared ($1.375, $0.975 and $0.855 per share for the period ended December 2014, 2013 and 2012, respectively)									(26,118)				(26,118)
Dividends to noncontrolling interests												(1,767)	(1,767)
Acquisition	325	325
Purchase of noncontrolling interest								(2,038)				(7,286)	(9,324)
Deconsolidation of EMD												(20,316)	(20,316)
Stock plan exercises; 97,974, 103,023 and 174,943 shares acquired for the period ended December 2014, 2013 and 2012, respectively											(16,107)		(16,107)
Stock options exercised; 194,627, 216,105 and 341,090 shares issued for the period ended December 2014, 2013 and 2012, respectively								(9,781)	9,770		16,359		16,348
Tax benefit from stock option exercises								5,306					5,306
Stock option expense								5,194					5,194
Stock awards; 22,010, 33,721 and 20,988 shares issued for the period ended December 2014, 2013 and 2012, respectively								1,319			1,343		2,662
Balance at Dec. 28, 2013							27,900		1,562,670	(47,685)	(20,860)	22,821	1,544,846
Increase (Decrease) in Shareholders' Equity
Net earnings									183,976			5,342	189,318
Other comprehensive income (loss)										(86,748)		(2,822)	(89,570)
Cash dividends declared ($1.375, $0.975 and $0.855 per share for the period ended December 2014, 2013 and 2012, respectively)									(35,036)				(35,036)
Dividends to noncontrolling interests												(2,919)	(2,919)
Acquisition			9,309	9,309	16,333	16,333
Addition of noncontrolling interest												508	508
Stock plan exercises; 97,974, 103,023 and 174,943 shares acquired for the period ended December 2014, 2013 and 2012, respectively											(15,403)		(15,403)
Purchase of treasury shares; 2,711,149 shares acquired											(395,045)		(395,045)
Stock options exercised; 194,627, 216,105 and 341,090 shares issued for the period ended December 2014, 2013 and 2012, respectively								(10,994)	7,052		18,514		14,572
Tax benefit from stock option exercises								4,264					4,264
Stock option expense								4,461					4,461
Stock awards; 22,010, 33,721 and 20,988 shares issued for the period ended December 2014, 2013 and 2012, respectively								2,269			2,498		4,767
Balance at Dec. 27, 2014							$ 27,900		$ 1,718,662	$ (134,433)	$ (410,296)	$ 48,572	$ 1,250,405