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Stockholders' Equity (Details) - $ / shares | 2 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 21, 2017 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015
Share Repurchase Program |  |  |  |
Number of shares purchased |  | 7,694,000 | 13,652,000 | 1,665,000
Average price per share |  | $ 37.81 | $ 28.77 | $ 34.17
Remaining authorization at October 31 |  | 8,144,000 | 15,838,000 | 18,535,000
Subsequent Event [Member] |  |  |  |
Share Repurchase Program |  |  |  |
Number of shares purchased | 4,200,000 |  |  |
Average price per share | $ 47.47 |  |  |

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- Definition The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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