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
	Dec. 28, 2019	Nov. 23, 2019	Dec. 28, 2019	Dec. 29, 2018	Dec. 28, 2019	Dec. 29, 2018
Shareholders' equity
Authorized repurchase of common stock under Share Repurchase Program	$ 2,950,000		$ 2,950,000		$ 2,950,000
Shares repurchased during period (in shares)			2.1		4.8
Cost of repurchase			$ 87,600		$ 199,700
Remaining authorized repurchase amount	505,700		$ 505,700		$ 505,700
Cash dividends paid per common share		$ 0.21	$ 0.21	$ 0.20	$ 0.42	$ 0.40
Dividends paid on common stock	$ 21,000				$ 42,426	$ 44,701