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Common Stock Repurchases (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2016 | Jan. 31, 2015 | Jan. 31, 2016 | Jan. 31, 2015 | Dec. 30, 2015 | Sep. 22, 2011
Stock Repurchased and Retired During Period Cost Per Share |  |  |  |  | $ 0 |
Common Shares Purchased Under Tender Offer, Value |  |  |  |  | $ 325.0 |
Remittance to taxing authorities under statutory withholding |  |  |  | $ 1.1 |  |
Number of stock options exercised |  |  | 100,000 |  |  |
Stock Repurchase Program 2011 [Member] |  |  |  |  |  |
Additional common stock authorized for repurchase (in shares) |  |  |  |  |  | 40,000,000
Common stock authorized for repurchase (in shares) |  |  |  |  |  | 98,000,000
Number of shares repurchased under the program | 50,518,282 |  | 50,518,282 |  |  |
Number of shares available for repurchase under stock repurchase program | 47,481,718 |  | 47,481,718 |  |  |
Executive Officers and Certain Employees [Member] |  |  |  |  |  |
Number of stock options exercised | 0 | 0 |  |  |  |
Common Stock [Member] | Dutch Auction [Member] |  |  |  |  |  |
Common stock authorized for repurchase (in shares) |  |  |  |  | 7,317,073 |
Number of shares repurchased under the program |  |  |  |  | 8,333,333 |
Maximum [Member] | Common Stock [Member] | Dutch Auction [Member] |  |  |  |  |  |
Stock Repurchase Program, Share Offer Price |  |  |  |  | $ 41.00 |
Minimum [Member] | Common Stock [Member] | Dutch Auction [Member] |  |  |  |  |  |
Stock Repurchase Program, Share Offer Price |  |  |  |  | $ 38.00 |

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