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Earnings Per Share - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended | 21 Months Ended | 9 Months Ended
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Jul. 31, 2014 | Jul. 31, 2013 | Jul. 31, 2014 | Jul. 31, 2014 | Jul. 31, 2014 Class A Common Stock [Member] Dividends | Jul. 31, 2013 Class A Common Stock [Member] | Jul. 31, 2014 Class B Common Stock [Member] | Jul. 31, 2013 Class B Common Stock [Member]
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Calculation of EPS |  |  |  |  | (i) multiply 40 percent times the average Class A shares outstanding, then divide that amount by the product of 40 percent of the average Class A shares outstanding plus 60 percent of the average Class B shares outstanding to get a percentage, (ii) undistributed net income divided by the average Class A shares outstanding, (iii) multiply item (i) by item (ii), (iv) add item (iii) to the Class A cash dividend per share. Diluted shares are factored into the Class A calculation. |  | (i) multiply 60 percent times the average Class B shares outstanding, then divide that amount by the product of 40 percent of the average Class A shares outstanding plus 60 percent of the average Class B shares outstanding to get a percentage, (ii) undistributed net income divided by the average Class B shares outstanding, (iii) multiply item (i) by item (ii), (iv) add item (iii) to the Class B cash dividend per share. Class B diluted EPS is identical to Class B basic EPS. |
Percentage of shares outstanding used in two class method calculation |  |  |  |  | 40.00% |  | 60.00% |
Cumulative dividends per share |  |  |  |  | $ 0.01 |  |  |
Non-Cumulative dividends per share |  |  |  |  |  |  | $ 0.005 |
Common stock dividend per share |  |  |  |  | $ 0.01 |  | $ 0.015 |
Cumulative dividend period in arrear for voting right |  |  |  |  | 4 |  |  |
Number of shares authorized to be purchased | 4,000,000 |  | 4,000,000 | 4,000,000 |  |  |  |
Repurchase of common stock |  |  |  | 0 | 0 | 0 | 0 | 0
Shares repurchased of common stock | 3,184,272 |  | 3,184,272 | 3,184,272 | 1,425,452 |  | 1,758,820 |
Antidilutive stock option | 0 | 0 | 0 |  |  |  |  |

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- Definition Calculation of earnings per share. + References No definition available. + Details
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- Definition Cumulative annual dividends per share rate. + References No definition available. + Details
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- Definition Non cumulative annual dividends per share. + References No definition available. + Details
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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: 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=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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- Definition Number of shares held for each class of treasury stock. + 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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