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Description of Business and Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Jul. 31, 2013
Description of Business and Summary of Significant Accounting Policies [Abstract]  
Schedule of change in the allowance for doubtful accounts
 
Year ended July 31
(in thousands)
 
Balance at
beginning of
year
  
Additions
charged to
costs and
expenses
  
Deductions
  
Balance at
end of year
 
2013
            
Reserves deducted from accounts receivable:
            
Allowance for doubtful accounts
 $11  $—  $(7) $4 
2012
                
Reserves deducted from accounts receivable:
                
Allowance for doubtful accounts
 $11  $—  $—  $11