Shareholders' equity (Share repurchase program textuals) (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended		6 Months Ended
	Nov. 17, 2020	Jan. 02, 2021	Jan. 02, 2021	Dec. 28, 2019	Jan. 02, 2021	Dec. 28, 2019
Shareholders' equity
Authorized repurchase of common stock under Share Repurchase Program		$ 2,950,000	$ 2,950,000		$ 2,950,000
Remaining authorized repurchase amount		469,000	$ 469,000		$ 469,000
Cash dividends paid per common share	$ 0.21		$ 0.21	$ 0.21	$ 0.42	$ 0.42
Dividends paid on common stock		$ 20,800			$ 41,512	$ 42,426