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Stock Repurchases (Details Textual) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended	12 Months Ended		67 Months Ended
	Apr. 30, 2017	Jul. 31, 2016	Jul. 31, 2015	Apr. 30, 2017	Dec. 30, 2015	Jul. 09, 2015	Sep. 22, 2011
Common stock authorized for repurchase (in shares)						27,777,776
Remittance to taxing authorities under statutory withholding	$ 134.6
Number of stock options exercised	20,598,000
Stock Repurchase Program 2011
Stock Repurchase Program Additional Number Of Shares Authorized Approved							80,000,000
Stock Repurchased and Retired During Period, Shares				106,913,602
Number of shares available for repurchase under stock repurchase program	89,086,398			89,086,398
Common Stock | Stock Repurchase Program 2011
Common stock authorized for repurchase (in shares)							196,000,000
Common Stock | Dutch Auction
Common stock authorized for repurchase (in shares)					14,634,146
Stock Repurchased and Retired During Period, Shares		16,666,666	12,508,122
Stock Repurchased and Retired During Period Cost Per Share					$ 19.50
Common Shares Purchased Under Tender Offer, Value		$ 325.0	$ 225.1
Maximum | Common Stock | Dutch Auction
Purchase Price Per Share Of Common Shares Purchased Under Tender Offer						$ 18.00
Stock Repurchase Program, Share Offer Price					20.50
Minimum | Common Stock | Dutch Auction
Purchase Price Per Share Of Common Shares Purchased Under Tender Offer						$ 17.38
Stock Repurchase Program, Share Offer Price					$ 19.00

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The number additional shares approved under company's stock repurchase program by the entity's board of directors.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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