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Restructuring (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
General and administrative expense
      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs $ 1,737 $ 2,209 $ 1,190
Yard operations expense
      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs 189 1,868 183
Severance
      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs 978 1,675  
Severance | General and administrative expense
      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs 978 1,675 1,190
Severance | Yard operations expense
      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs         
Employee Relocation | General and administrative expense
      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs 759 534   
Employee Relocation | Yard operations expense
      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs $ 189 $ 745 $ 183