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Employee Benefit Plans (Summary Of Stock Option Activity) (Details) - $ / shares
9 Months Ended 12 Months Ended
Apr. 28, 2018
Jul. 29, 2017
Number Outstanding    
Beginning balance (in shares) 12,000,000 73,000,000
Assumed from acquisitions (in shares) 3,000,000 8,000,000
Exercised (in shares) (6,000,000) (14,000,000)
Canceled/forfeited/expired (in shares) (1,000,000) (55,000,000)
Ending balance (in shares) 8,000,000 12,000,000
Weighted-Average Exercise Price per Share    
Beginning balance (in dollars per share) $ 6.15 $ 26.78
Assumed from acquisitions (in dollars per share) 8.20 4.47
Exercised (in dollars per share) 5.79 12.11
Canceled/forfeited/expired (in dollars per share) 8.48 31.83
Ending Balance (in dollars per share) $ 7.02 $ 6.15