SIGNIFICANT ACCOUNTING POLICIES (Details 2) (USD $)	12 Months Ended
	Dec. 30, 2012 item	Dec. 25, 2011	Dec. 26, 2010
Depreciation
Property, plant and equipment, gross	$ 1,476,321,000	$ 1,459,635,000
Less accumulated depreciation	(742,592,000)	(698,658,000)
Property, plant and equipment, net	733,729,000	760,977,000
Depreciation expense	67,100,000	63,200,000	74,800,000
Segment reporting
Number of reportable segments	1
Stock-based compensation
Stock-based compensation expense	3,523,000	5,174,000	4,626,000
Number of stock-based compensation plans	5
Long-term debt fair value disclosure
Estimated fair value of long-term debt	1,600,000,000
Carrying value of long-term debt	1,670,346,000	1,577,476,000
Land
Depreciation
Property, plant and equipment, gross	311,959,000	308,489,000
Buildings and improvements
Depreciation
Property, plant and equipment, gross	364,951,000	362,091,000
Buildings and improvements | Minimum
Depreciation
Estimated Useful Lives	5 years
Buildings and improvements | Maximum
Depreciation
Estimated Useful Lives	60 years
Equipment
Depreciation
Property, plant and equipment, gross	775,397,000	784,592,000
Equipment | Minimum
Depreciation
Estimated Useful Lives	2 years
Equipment | Maximum
Depreciation
Estimated Useful Lives	25 years
Construction in process
Depreciation
Property, plant and equipment, gross	$ 24,014,000	$ 4,463,000
Presses | Minimum
Depreciation
Estimated Useful Lives	9 years
Presses | Maximum
Depreciation
Estimated Useful Lives	25 years
Other equipment | Minimum
Depreciation
Estimated Useful Lives	2 years
Other equipment | Maximum
Depreciation
Estimated Useful Lives	15 years