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Consolidated Statements of Changes in Shareholders' Investment (Parenthetical)
 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 09, 2016
Jul. 24, 2016
$ / shares
Jul. 26, 2015
$ / shares
 [1]
Jul. 24, 2016
$ / shares
Jul. 26, 2015
$ / shares
 [1]
Oct. 25, 2015
$ / shares
 [2]
Declared cash dividends (in dollars per share)   $ 0.145 $ 0.125 $ 0.435 $ 0.375 $ 0.50
Common Stock            
Authorized stock split ratio 2          
[1] Shares and per share figures have been restated to give effect to the two-for-one stock split distributed on February 9, 2016.
[2] Per share figures have been restated to give effect to the two-for-one stock split distributed on February 9, 2016