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Allowance For Doubtful Accounts For Trade Accounts Receivable (Tables)
3 Months Ended
Jan. 31, 2013
Allowance For Doubtful Accounts For Trade Accounts Receivable [Abstract]  
Summary Of Changes In The Allowance For Doubtful Accounts For Trade Accounts Receivable
    Three Months Ended  
    January 31,  
    2013     2012  
 
Balance at beginning of period $ 92,148   $ 145,616  
Bad debt recovery   (7,095 )   (8,644 )
Losses charged to allowance   387      
Balance at end of period $ 85,440   $ 136,972