CONDENSED CONSOLIDATED BALANCE SHEETS (PARENTHETICAL) (USD $) In Thousands, except Share data	Sep. 25, 2011	Dec. 26, 2010
Assets
Accounts receivable, allowances	$ 23,800	$ 30,209
Property, plant and equipment, accumulated depreciation and amortization	1,117,481	1,048,956
Goodwill, accumulated impairment losses	957,311	805,218
Other intangible assets acquired, accumulated amortization	$ 69,755	$ 69,383
Stockholders' Equity
Common stock, par value	$ 0.10	$ 0.10
Class A Common Stock
Stockholders' Equity
Common stock, shares authorized	300,000,000	300,000,000
Common stock, shares issued	149,967,099	149,302,487
Treasury stock, shares	3,340,711	3,970,238
Class B Common Stock
Stockholders' Equity
Common stock, shares authorized	818,885	819,125
Common stock, shares issued	818,885	819,125
Treasury stock, shares	0	0