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Stockholder's Equity (Details Textuals 1) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended | 58 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2015 | Apr. 30, 2016 | Jul. 31, 2016 | Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2016 | Dec. 30, 2015 | Jul. 09, 2015 | Sep. 22, 2011
Stock Repurchase [Abstract] |  |  |  |  |  |  |  |  |
Additional common stock authorized for repurchase (in shares) |  |  |  |  |  |  |  |  | 40,000,000
Common stock authorized for repurchase (in shares) |  |  |  |  |  |  |  | 13,888,888 |
Remittance to taxing authorities under statutory withholding in fiscal year 2013, 2012 and 2011 |  |  | $ 15.0 | $ 3.8 | $ 0.1 |  |  |  |
Stock Repurchase Program 2011 [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase [Abstract] |  |  |  |  |  |  |  |  |
Common stock authorized for repurchase (in shares) |  |  |  |  |  |  |  |  | 98,000,000
Company repurchased common stock (in shares) |  |  | 2,938,519 | 231,500 |  | 53,456,801 |  |  |
Company repurchased common stock |  |  | $ 117.9 | $ 8.3 |  |  |  |  |
Shares remaining available for repurchase |  |  | 44,543,199 |  |  | 44,543,199 |  |  |
Common Stock [Member] | Stock Repurchase Program 2011 [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase [Abstract] |  |  |  |  |  |  |  |  |
Stock repurchase price per share (in dollars per share) |  |  | $ 40.13 |  | $ 36.02 | $ 40.13 |  |  |
Common Stock [Member] | Dutch Auction [Member] |  |  |  |  |  |  |  |  |
Stock Repurchase [Abstract] |  |  |  |  |  |  |  |  |
Common stock authorized for repurchase (in shares) |  |  |  |  |  |  | 7,317,073 |  |
Company repurchased common stock (in shares) | 6,254,061 | 8,333,333 |  |  |  |  |  |  |
Stock repurchase price per share (in dollars per share) |  |  |  |  |  |  | $ 39.00 |  |
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 |  |  |  |  |  |  | 41.00 |  |
Tender price to purchase common shares |  |  |  |  |  |  |  | $ 36.00 |
Common Stock [Member] | Dutch Auction [Member] | Minimum |  |  |  |  |  |  |  |  |
Stock Repurchase [Abstract] |  |  |  |  |  |  |  |  |
Stock Repurchase Program, Share Offer Price |  |  |  |  |  |  | $ 38.00 |  |
Tender price to purchase common shares |  |  |  |  |  |  |  | $ 34.75 |

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