Consolidated Balance Sheets (Unaudited) Parenthetical - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 30, 2018	Jul. 01, 2018
Current assets
Accounts receivable, allowance for doubtful accounts	$ 17,000	$ 9,100	$ 95,900
Property, plant and equipment, accumulated depreciation	490,000	462,700	444,500
Other assets
Other intangibles, accumulated amortization	$ 759,900	$ 721,700	$ 915,900
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)	83,488,022	83,565,598	82,370,078