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Capital Stock - Narratives (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 15, 2015
Sep. 09, 2015
Apr. 29, 2017
Jan. 28, 2017
Jul. 29, 2017
Jul. 30, 2016
Jul. 25, 2015
Equity, Class of Treasury Stock [Line Items]              
Repurchase of common stock, shares 805,000 805,000 400,000 313,006 713,006 2,511,578 1,669,924
Average Price Per Share (in dollars per share)   $ 74.53 $ 94.77 $ 79.87 $ 88.23 $ 67.69 $ 52.19
Repurchases of common stock     $ 37,900,000 $ 25,000,000 $ 62,909,000 $ 169,997,000 $ 87,146,000
Stock repurchased and retired during period, value $ 60,000,000 $ 60,000,000     62,909,000 169,997,000 $ 87,146,000
Remaining authorized shares for repurchases (shares)         112,100,000 100,000,000  
Shares repurchased value     $ 75,000,000.0   75,000,000.0    
Cumulative effect on retained earnings         $ 42,800,000 $ 17,100,000  
Shares paid for tax withholding for share based compensation         134,736 161,988 145,395
Value of shares paid for tax withholding for share based compensation         $ 10,800,000 $ 12,600,000 $ 4,700,000
Notes Offering              
Equity, Class of Treasury Stock [Line Items]              
Repurchases of common stock           $ 110,000,000