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INVENTORIES (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 25, 2010
Dec. 26, 2009
Dec. 31, 2011
INVENTORIES      
Raw materials and purchased parts $ 133,380   $ 202,953
Work-in-process 25,891   28,053
Finished goods and manufactured goods 163,511   212,312
Subtotal 322,782   443,318
Less: LIFO reserve 42,559   49,536
Net inventory 280,223   393,782
Increase in operating income due to liquidating portion of LIFO inventories $ 1,509 $ 5,503