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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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