Consolidated Balance Sheets (Unaudited) Parenthetical (USD $) In Thousands, except Share data, unless otherwise specified	Apr. 01, 2012	Dec. 25, 2011	Mar. 27, 2011
Current assets
Accounts receivable, allowance for doubtful accounts	$ 24,800	$ 23,700	$ 33,300
Property, plant and equipment, accumulated depreciation	466,200	453,700	437,900
Other assets
Other intangibles, accumulated amortization	$ 626,800	$ 622,500	$ 586,700
Shareholders' equity
Preference stock, par value (in dollars per share)	$ 2.50	$ 2.50	$ 2.50
Preference stock, authorized shares (in shares)	5,000,000	5,000,000	5,000,000
Preference stock, issued (in shares)	0	0	0
Common stock, par value (in dollars per share)	$ 0.50	$ 0.50	$ 0.50
Common stock, authorized shares (in shares)	600,000,000	600,000,000	600,000,000
Common stock, issued (in shares)	209,694,630	209,694,630	209,694,630
Treasury stock, at cost; shares (in shares)	80,016,477	81,061,373	72,890,160