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Stock Repurchases (Details Textual) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended | 61 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2016 | Oct. 31, 2015 | Jul. 31, 2015 | Jul. 31, 2015 | Oct. 31, 2016 | Dec. 30, 2015 | Jul. 09, 2015 | Sep. 22, 2011
Common stock authorized for repurchase (in shares) |  |  |  |  |  |  | 13,888,888 |
Remittance to taxing authorities under statutory withholding |  | $ 134.6 |  |  |  |  |  |
Number of stock options exercised | 9,689,000 |  |  |  |  |  |  |
Stock Repurchase Program 2011 |  |  |  |  |  |  |  |
Stock Repurchase Program Additional Number Of Shares Authorized Approved |  |  |  |  |  |  |  | 40,000,000
Stock Repurchased and Retired During Period, Shares |  |  |  |  | 53,456,801 |  |  |
Number of shares available for repurchase under stock repurchase program | 44,543,199 |  |  |  | 44,543,199 |  |  |
Common Stock | Stock Repurchase Program 2011 |  |  |  |  |  |  |  |
Common stock authorized for repurchase (in shares) |  |  |  |  |  |  |  | 98,000,000
Common Stock | Dutch Auction |  |  |  |  |  |  |  |
Common stock authorized for repurchase (in shares) |  |  |  |  |  | 7,317,073 |  |
Stock Repurchased and Retired During Period, Shares | 8,333,333 |  | 6,254,061 |  |  |  |  |
Stock Repurchased and Retired During Period Cost Per Share |  |  |  |  |  | $ 39.00 |  |
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 |  |  |  |  |  |  | $ 36.00 |
Stock Repurchase Program, Share Offer Price |  |  |  |  |  | 41.00 |  |
Minimum | Common Stock | Dutch Auction |  |  |  |  |  |  |  |
Purchase Price Per Share Of Common Shares Purchased Under Tender Offer |  |  |  |  |  |  | $ 34.75 |
Stock Repurchase Program, Share Offer Price |  |  |  |  |  | $ 38.00 |  |

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