Shareholders' equity (Share repurchase program textuals) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 24, 2018	Dec. 29, 2018	Dec. 30, 2017	Dec. 29, 2018	Dec. 30, 2017
Shareholders' equity
Authorized repurchase of common stock under Share Repurchase Program		$ 2,450,000		$ 2,450,000
Shares repurchased during period (in shares)		4.1		7.4
Cost of repurchase		$ 175,100		$ 332,000
Remaining authorized repurchase amount		$ 440,100		$ 440,100
Cash dividends paid per common share	$ 0.20	$ 0.20	$ 0.18	$ 0.40	$ 0.36
Dividends paid on common stock		$ 21,800		$ 44,701	$ 43,572