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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. 31, 2016
Nov. 26, 2016
Dec. 31, 2016
Jan. 02, 2016
Dec. 31, 2016
Jan. 02, 2016
Shareholders' equity            
Authorized repurchase of common stock under Share Repurchase Program $ 1,250,000   $ 1,250,000   $ 1,250,000  
Aggregate number of shares repurchased since inception (in shares) 31.4   31.4   31.4  
Aggregate cost of shares repurchased since inception $ 1,080,000   $ 1,080,000   $ 1,080,000  
Remaining authorized repurchase amount 174,900   $ 174,900   $ 174,900  
Cash dividends paid per common share   $ 0.17 $ 0.17 $ 0.17 $ 0.34 $ 0.34
Dividends paid on common stock $ 21,800       $ 43,426 $ 45,020