Consolidated Balance Sheets (Unaudited) Parenthetical - USD ($) $ in Thousands	Jul. 02, 2017	Dec. 25, 2016	Jun. 26, 2016
Current assets
Accounts receivable, allowance for doubtful accounts	$ 15,200	$ 16,800	$ 32,800
Property, plant and equipment, accumulated depreciation	408,200	383,700	375,300
Other assets
Other intangibles, accumulated amortization	$ 891,800	$ 876,000	$ 858,700
Shareholders' equity
Preference stock, par value (in dollars per share)	$ 2.5	$ 2.5	$ 2.5
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)	$ 0.5	$ 0.5	$ 0.5
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)	84,615,971	85,207,677	84,241,018