Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 28, 2020	Dec. 29, 2019	Jun. 30, 2019
ASSETS
Restricted cash	$ 71,900	$ 0	$ 0
Accounts receivable, allowance for doubtful accounts	28,000	17,200	17,000
Property, plant and equipment, accumulated depreciation	528,200	505,900	490,000
Other intangibles, accumulated amortization	$ 855,000	$ 783,500	$ 759,900
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)	220,286,736	220,286,736	209,694,630
Treasury stock (in shares)	83,264,365	83,424,129	83,488,022