Earnings Per Share - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended	21 Months Ended	9 Months Ended
	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