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Stockholder's Equity (Details Textuals 1) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended | 70 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 31, 2015 | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2017 | Dec. 30, 2015 | Jul. 09, 2015 | Sep. 22, 2011
Stock Repurchase [Abstract] |  |  |  |  |  |  |  |
Additional common stock authorized for repurchase (in shares) |  |  |  |  |  |  |  | 80,000,000
Common stock authorized for repurchase (in shares) |  |  |  |  |  |  |  | 196,000,000
Company repurchased common stock (in shares) |  | 0 | 5,877,038 | 463,000 | 106,913,602 |  |  |
Company repurchased common stock | $ 8.3 |  | $ 117.9 |  |  |  |  |
Shares remaining available for repurchase |  | 89,086,398 |  |  | 89,086,398 |  |  |
Remittance to taxing authorities under statutory withholding in fiscal year 2013, 2012 and 2011 |  | $ 134.6 | $ 15.0 | $ 3.8 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |
Stock Repurchase [Abstract] |  |  |  |  |  |  |  |
Stock repurchase price per share (in dollars per share) | $ 18.01 |  | $ 20.065 | $ 18.01 |  |  |  |
Common Stock [Member] | Dutch Auction [Member] |  |  |  |  |  |  |  |
Stock Repurchase [Abstract] |  |  |  |  |  |  |  |
Common stock authorized for repurchase (in shares) |  |  |  |  |  | 14,634,146 | 27,777,776 |
Company repurchased common stock (in shares) |  |  | 16,666,666 | 12,508,122 |  |  |  |
Stock repurchase price per share (in dollars per share) |  |  |  |  |  | $ 19.50 |  |
Common Shares Purchased Under Tender Offer, Value |  |  | $ 325.0 | $ 225.1 |  |  |  |
Common Stock [Member] | Dutch Auction [Member] | Maximum |  |  |  |  |  |  |  |
Stock Repurchase [Abstract] |  |  |  |  |  |  |  |
Stock Repurchase Program, Share Offer Price |  |  |  |  |  | 20.50 |  |
Tender price to purchase common shares |  |  |  |  |  |  | $ 18.00 |
Common Stock [Member] | Dutch Auction [Member] | Minimum |  |  |  |  |  |  |  |
Stock Repurchase [Abstract] |  |  |  |  |  |  |  |
Stock Repurchase Program, Share Offer Price |  |  |  |  |  | $ 19.00 |  |
Tender price to purchase common shares |  |  |  |  |  |  | $ 17.375 |

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