Consolidated Balance Sheets (Unaudited) Parenthetical - USD ($) $ in Thousands	Sep. 27, 2015	Dec. 28, 2014	Sep. 28, 2014
Current assets
Accounts receivable, allowance for doubtful accounts	$ 16,200	$ 15,900	$ 21,100
Property, plant and equipment, accumulated depreciation	358,100	508,600	513,700
Other assets
Other intangibles, accumulated amortization	$ 832,900	$ 797,500	$ 782,900
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)	84,987,076	85,168,478	83,535,298