Shareholders' equity (Share repurchase program textuals) (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	1 Months Ended	3 Months Ended
	Aug. 27, 2016	Oct. 01, 2016	Oct. 03, 2015
Shareholders' equity
Authorized repurchase of common stock under Share Repurchase Program		$ 1,250,000
Aggregate number of shares repurchased since inception (in shares)		31.4
Aggregate cost of shares repurchased since inception		$ 1,080,000
Remaining authorized repurchase amount		$ 174,900
Cash dividends paid per common share	$ 0.17	$ 0.17	$ 0.17
Dividends paid on common stock		$ 21,676	$ 22,612