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Earnings Per Share - Additional Information (Detail) - shares | 1 Months Ended | 12 Months Ended | 36 Months Ended
--- | --- | --- | ---
Jul. 31, 2017 | Oct. 31, 2017 | Oct. 31, 2016 | Oct. 31, 2015 | Oct. 31, 2016
Class of Stock [Line Items] |  |  |  |  |
Number of shares authorized to be purchased (shares) |  | 4,000,000,000,000 |  |  |
Repurchase of common stock (shares) |  | 3,296,513 |  |  | 0
Remaining number of shares authorized to be repurchased |  | 4,703,487 |  |  |
Antidilutive stock option (shares) |  | 0 | 0 | 0 |
Class A Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Percentage of shares outstanding used in two class method calculation |  | 40.00% |  |  |
Voting rights |  | The Class A Common Stock has no voting rights unless four quarterly cumulative dividends upon the Class A Common Stock are in arrears. |  |  |
Repurchase of common stock (shares) |  | 1,425,452 |  |  |
Class B Common Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Percentage of shares outstanding used in two class method calculation |  | 60.00% |  |  |
Voting rights |  | The Class B Common Stock has full voting rights. |  |  |
Number of shares authorized to be purchased (shares) |  | 110,241 |  |  |
Repurchase of common stock (shares) | 2,000 | 1,871,061 |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Description of voting rights of common stock. Includes eligibility to vote and votes per share owned. Include also, if any, unusual voting rights. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 + Details
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- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21463-112644 + Details
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