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Restructuring (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
General and administrative expense      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs $ 565 $ 5,089 $ 1,737
Yard operations      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs 25 (28) 189
Severance      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs 590 4,598  
Severance | General and administrative expense      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs 310 4,598 978
Relocation | General and administrative expense      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs 255 491 759
Relocation | Yard operations      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs 25 (28) 189
Impairment | Yard operations      
Restructuring Cost and Reserve [Line Items]      
Restructuring-related costs $ 0 $ 0 $ 0