ACQUISITIONS (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended			3 Months Ended	6 Months Ended	0 Months Ended	3 Months Ended	6 Months Ended	0 Months Ended		1 Months Ended
	Jun. 29, 2013	Jun. 29, 2013	Jun. 28, 2014	Dec. 28, 2013	Jun. 28, 2014 DS SM, Locker, and Armorflex acquisitions	Jun. 28, 2014 DS SM, Locker, and Armorflex acquisitions	Mar. 03, 2014 Valmont SM item	Jun. 28, 2014 Valmont SM	Jun. 28, 2014 Valmont SM	Feb. 05, 2013 Locker	Feb. 05, 2013 Locker Maximum	Dec. 28, 2013 Armorflex International Ltd.
Acquisitions
Ownership percentage acquired							90.00%			100.00%		100.00%
Annual sales							$ 190,000
Number of manufacturing locations operated							2
Cash acquired							56			116
Cash paid for acquisition							120,483			53,152		10,000
Fair value of contingent consideration							0				7,911
Fair values of the assets acquired and liabilities assumed
Current assets							73,421
Property, plant and equipment							88,917
Intangible assets							30,340					3,792
Goodwill			368,405	349,632			11,846					6,823
Total fair value of assets acquired							204,524
Current liabilities							50,953
Deferred income taxes							14,915
Intercompany note payable							37,448
Long-term debt							8,941
Total fair value of liabilities assumed							112,257
Non-controlling interests							9,232
Net assets acquired							83,035
Net sales and net earnings included in Consolidated Statements of Earnings
Net sales included in Consolidated Statements of Earnings					69,473	104,054		47,217	64,521
Net earnings included in Consolidated Statements of Earnings					3,888	5,574		2,925	4,102
Period at the end of which contingent consideration is to be paid										2 years
Present value of the potential additional purchase price										7,178
Pro forma results of operations
Net sales	929,722	1,797,577
Net earnings	$ 92,791	$ 172,224
Earnings per share-diluted	$ 3.44	$ 6.41