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Stockholders' Equity (Details) |  |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 05, 2016 USD ($) $ / shares | Feb. 09, 2016 USD ($) $ / shares | Aug. 06, 2015 USD ($) $ / shares | Feb. 09, 2015 USD ($) $ / shares | Oct. 31, 2015 USD ($) $ / shares shares | Jul. 31, 2015 shares | Apr. 30, 2015 shares | Jan. 31, 2015 USD ($) $ / shares shares | Oct. 31, 2016 USD ($) $ / shares shares | Oct. 31, 2015 USD ($) $ / shares shares | Oct. 31, 2014 USD ($) | Dec. 15, 2011 USD ($)
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, maximum amount authorized |  |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Number of shares purchased | shares |  |  |  |  | 368,000 | 0 | 0 | 100,000 | 0 | 467,539 |  |
Cost of common stock repurchased |  |  |  |  | $ 51,300,000 |  |  | $ 16,000,000 |  | $ 67,304,000 | $ 75,778,000 |
Share repurchase program, remaining authorized amount |  |  |  |  | $ 118,400,000 |  |  |  |  | 118,400,000 |  |
Average purchase price per share (usd per share) | $ / shares |  |  |  |  | $ 139.60 |  |  | $ 159.96 |  |  |  |
Dividends on common stock | $ 1,500,000 | $ 1,400,000 | $ 1,500,000 | $ 1,400,000 |  |  |  |  | $ 2,914,000 | $ 2,906,000 | $ 2,884,000 |
Cash dividend, per share (usd per share) | $ / shares | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 |  |  |  |  | $ 0.03 |  |  |
Date of record | Jul. 22, 2016 | Jan. 22, 2016 | Jul. 24, 2015 | Jan. 23, 2015 |  |  |  |  |  |  |  |
Common stock purchase right versus preferred share purchase right |  |  |  |  |  |  |  |  | 0.5 |  |  |
Percentage of acquisition of beneficial ownership |  |  |  |  |  |  |  |  | 20.00% |  |  |
Purchase price of the Right, subject to adjustment (usd per right) |  |  |  |  |  |  |  |  | $ 450 |  |  |
Percentage of assets or earning power sold |  |  |  |  |  |  |  |  | 50.00% |  |  |
Board of Directors may redeem the rights at, price per right (in usd per share) | $ / shares |  |  |  |  | $ 0.01 |  |  |  |  | $ 0.01 |  |

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- Definition Minimum percentage of common stock to be acquired in order to exercise share purchase rights. + References No definition available. + Details
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- Definition Final price paid per share for the purchase of the targeted number of shares, determined by an average market price over a fixed period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 25 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6405686&loc=d3e22802-112653 + Details
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