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Stockholders' Equity (Details) |  |  |  |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 07, 2017 USD ($) $ / shares | Feb. 09, 2017 USD ($) $ / shares | Aug. 05, 2016 USD ($) $ / shares | Feb. 09, 2016 USD ($) $ / shares | Oct. 31, 2017 USD ($) $ / shares shares | Apr. 30, 2017 USD ($) $ / shares shares | Oct. 31, 2017 USD ($) shares | Oct. 31, 2016 USD ($) shares | Oct. 31, 2015 USD ($) | Mar. 01, 2017 USD ($) | Feb. 28, 2017 USD ($)
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |
Share repurchase program, maximum amount authorized |  |  |  |  |  |  |  |  |  | $ 1,000,000,000.0 | $ 500,000,000.0
Number of shares purchased | shares |  |  |  |  | 108,000 | 150,000 | 257,500 | 0 |  |  |
Cost of common stock repurchased |  |  |  |  | $ 25,500,000 | $ 29,500,000 | $ 55,000,000 |  | $ 67,300,000 |  |
Share repurchase program, remaining authorized amount |  |  |  |  | $ 563,500,000 |  | 563,500,000 |  |  |  |
Average purchase price per share (usd per share) | $ / shares |  |  |  |  | $ 237.12 | $ 196.82 |  |  |  |  |
Dividends on common stock | $ 1,500,000 | $ 1,500,000 | $ 1,500,000 | $ 1,400,000 |  |  | $ 2,900,000 | $ 2,900,000 | $ 2,900,000 |  |
Cash dividend, per share (usd per share) | $ / shares | $ 0.03 | $ 0.03 | $ 0.03 | $ 0.03 |  |  |  |  |  |  |
Date of record | Jul. 21, 2017 | Jan. 23, 2017 | Jul. 22, 2016 | Jan. 22, 2016 |  |  |  |  |  |  |
Common stock purchase right versus preferred share purchase right |  |  |  |  |  |  | 0.5 |  |  |  |

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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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- Definition Aggregate dividends paid during the period for each share of common stock outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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