Shareholders' equity (Share repurchase program textuals) (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	3 Months Ended
	Aug. 05, 2020	Oct. 03, 2020	Oct. 03, 2020	Sep. 28, 2019
Shareholders' equity
Authorized repurchase of common stock under Share Repurchase Program		$ 2,950,000	$ 2,950,000
Remaining authorized repurchase amount		469,000	$ 469,000
Cash dividends paid per common share	$ 0.21		$ 0.21	$ 0.21
Dividends paid on common stock		$ 20,800	$ 20,756	$ 21,451