QUARTERLY FINANCIAL DATA (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Dec. 28, 2013	Dec. 26, 2015	Sep. 26, 2015	Jun. 27, 2015	Mar. 28, 2015	Dec. 27, 2014	Sep. 27, 2014	Jun. 28, 2014	Mar. 29, 2014	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales		$ 633,828	$ 632,575	$ 682,123	$ 670,398	$ 763,136	$ 765,668	$ 842,599	$ 751,740	$ 2,618,924	$ 3,123,143	$ 3,304,211
Gross profit		129,280	156,751	169,548	165,454	181,158	199,500	220,477	206,982	621,033	808,117	945,228
Net Earnings, Amount		$ (30,561)	$ 12,066	$ 27,873	$ 30,739	$ 40,461	$ 23,559	$ 63,976	$ 55,980	$ 40,117	$ 183,976	$ 278,489
Net Earnings, Per Share, Basic (in dollars per share)		$ (1.34)	$ 0.52	$ 1.19	$ 1.29	$ 1.67	$ 0.93	$ 2.40	$ 2.10	$ 1.72	$ 7.15	$ 10.45
Net Earnings, Per Share, Diluted (in dollars per share)		(1.34)	0.52	1.19	1.28	1.66	0.92	2.38	2.08	1.71	7.09	10.35
Stock Price, High (in dollars per share)		117.94	121.23	128.26	130.26	139.31	155.62	163.23	155.64	130.26	163.23
Stock Price, Low (in dollars per share)		93.99	97.44	118.09	117.56	123.44	131.68	143.02	141.74	93.99	123.44
Dividends Declared (in dollars per share)		$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 0.375	$ 0.250	$ 1.500	$ 1.375	$ 0.975
Quarterly Financial Data
Restructuring and related cost, expected cost remaining		$ 11,500	$ 6,300							$ 11,500
Restructuring expenses (in dollars per share)										$ 0.58
Impairment of goodwill and intangible assets			$ 13,400							$ 41,970	$ 0	$ 0
Impairment of goodwill and intangible assets (in dollars per share		$ 1.16	$ 0.58							$ 1.72
Goodwill impairment		$ 7,100								$ 34,892
Impairment of intangible assets		19,600
Increase (decrease) in product warranty reserve		$ 11,500
Increase (decrease) in product warranty reserve (in dollars per share)		$ 0.50
Increase (decrease) in allowance for bad debt		$ 4,800
Increase (decrease) in allowance for bad debt (in dollars per share)		$ 0.21
Foreign corporate income tax rate										18.00%	20.00%
Increase (decrease) in income taxes		$ 7,100
Increase (decrease) in income taxes (in dollars per share)		$ 0.31
Refinancing of long-term debt							$ 24,200				$ 24,200
Refinancing of long-term debt (in dollars per share)							$ 0.95				$ 0.93
Delta EMD, Ltd.
Quarterly Financial Data
Fair market value gain (loss) on remaining investment	$ 3,452						$ (1,400)				$ (3,800)
Fair market value gain (loss) on remaining investment (in dollars per share)							$ 0.05
Broad Restructuring Plan
Quarterly Financial Data
Restructuring and related cost, expected cost remaining		$ 39,852		$ 9,800						$ 39,852
Restructuring expenses (in dollars per share)		$ 0.50	$ 0.27	$ 0.42