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Summary of Significant Accounting Policies (Details Textuals) (USD $)
 12 Months Ended
Jul. 31, 2012
Segments
Jul. 31, 2011
Jul. 31, 2010
Accounting Policies [Abstract]      
Common stock outstanding reclassified from no par value to par value $ 12,000 $ 13,000  
Par value of common stock on reclassification from no par value to par value (in dollars per share) $ 0.0001 $ 0.0001  
Number of shares issued as stock dividend for each share held (in shares) 1    
Number of operating segments 2    
Number of reportable segment 1    
Accelerated recognition in service revenue   14,400,000  
Accelerated recognition in yard operation expenses   13,500,000  
Advertising expenses $ 6,500,000 $ 8,800,000 $ 12,700,000