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Earnings Per Share - Additional Information (Detail) (USD $)
 3 Months Ended 6 Months Ended 18 Months Ended
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2014
Class of Stock [Line Items]          
Number of shares authorized to be purchased 4,000,000   4,000,000   4,000,000
Repurchase of common stock         0
Shares repurchased of common stock 3,184,272   3,184,272   3,184,272
Antidilutive stock option 0 0 0 0  
Class A 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. Diluted shares are factored into the Class A calculation.    
Percentage of shares outstanding used in two class method calculation     40.00%    
Cumulative dividends per share     $ 0.01    
Common stock dividend per share     $ 0.01    
Cumulative dividend period in arrear for voting right     4    
Repurchase of common stock     0 0  
Shares repurchased of common stock 1,425,452   1,425,452   1,425,452
Class B Common Stock [Member]
          
Class of Stock [Line Items]          
Calculation of EPS     (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. Class B diluted EPS is identical to Class B basic EPS.    
Percentage of shares outstanding used in two class method calculation     60.00%    
Non-Cumulative dividends per share     $ 0.005    
Common stock dividend per share     $ 0.015    
Repurchase of common stock     0 0  
Shares repurchased of common stock 1,758,820   1,758,820   1,758,820