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Note 12 (Detail) (USD $)
 3 Months Ended 6 Months Ended 27 Months Ended 3 Months Ended
Apr. 30, 2012
Apr. 30, 2013
Apr. 30, 2012
Oct. 31, 2012
Feb. 09, 2011
Feb. 09, 2011
Initial [Member]
Feb. 14, 2011
Additional [Member]
Apr. 30, 2013
Common Class A [Member]
Life of the Issuance [Member]
Apr. 30, 2013
Minimum [Member]
Apr. 30, 2013
Maximum [Member]
Apr. 30, 2013
Life of the Issuance [Member]
Apr. 30, 2013
Tangible Equity Units [Member]
Apr. 30, 2012
Amortizing Notes [Member]
Tangible Equity Units, Units Issued           3,000,000 450,000            
Tangible Equity Units, Rate   7.25%     7.25%             7.25%  
Subordinated Debt (in Dollars)   $ 4,180,000   $ 6,091,000 [1]               $ 4,200,000  
Tangible Equity Units, Cash Installment, Per Note (in Dollars per share)   $ 0.453125                      
Tangible Equity Units Rate Per Year   7.25%                      
Tangible Equity Units, Stated Amount (in Dollars per share)   $ 25                      
Tangible Equity Units, Annual Interest Rate   12.072%                      
Tangible Equity Units, Number of Shares Upon Conversion, Per Unit                 4.7655 5.8140      
Prepaid Stock Purchase Contracts Issued (in Dollars)                       68,100,000  
Tangible Equity Units, Number Converted   600,000                 2,200,000    
Prepaid Stock Purchase Contracts Shares Settled   2,700,000           10,400,000          
Stock Issued (in Dollars)                         3,100,000
Gains (Losses) on Extinguishment of Debt (in Dollars) $ 27,039,000   $ 51,737,000                   $ 200,000
[1] Derived from the audited balance sheet as of October 31, 2012.