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Earnings Per Share - Reconciliation of Shares Used to Calculate Basic and Diluted Earnings Per Share (Detail)
 3 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Class A Common Stock [Member]
    
Class A Common Stock:    
Basic shares 25,316,395 25,052,868
Assumed conversion of stock options 65,682 141,377
Diluted shares 25,382,077 25,194,245
Class B Common Stock [Member]
    
Class A Common Stock:    
Basic shares 22,100,000 22,100,000
Diluted shares 22,100,000 22,100,000
Class B Common Stock:    
Basic and diluted shares 22,119,966 22,120,966