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Intangibles, Net
 12 Months Ended
Jul. 31, 2013
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangibles, Net
(7)
   Intangibles, Net
 
Intangible assets consist of the following (in thousands, except remaining useful life):
     July 31, 2013   
     Gross
Carrying
Amount		   Accumulated
Amortization		   Net Book Value   Weighted
Average
Remaining
Useful Life
(in years)
Amortized intangible assets:
                                                                    
Covenants not to compete
               $ 12,515          $ (10,965 )         $ 1,550             4    
Supply contracts
                  26,322             (21,757 )            4,565             8    
Customer relationships
                  7,389             (395 )            6,994             6    
Trade name
                  2,998             (402 )            2,596             4    
Licenses and databases
                  3,306             (1,305 )            2,001             3    
 
               $ 52,530          $ (34,824 )         $ 17,706                  
 
     July 31, 2012   
     Gross
Carrying
Amount		   Accumulated
Amortization		   Net Book Value   Weighted
Average
Remaining
Useful Life
(in years)
Amortized intangible assets:
                                                                        
Covenants not to compete
               $ 11,087          $ (10,685 )         $ 402              4    
Supply contracts
                  26,041             (18,762 )            7,279             6    
Licenses and databases
                  1,316             (1,012 )            304              1    
 
               $ 38,444          $ (30,459 )         $ 7,985                  
 
Aggregate amortization expense on intangible assets was $4.8 million, $4.5 million and $4.7 million for the fiscal years ended July 31, 2013, 2012 and 2011, respectively. Intangible amortization expense for the next five fiscal years based upon July 31, 2013 intangible assets is expected to be as follows (in thousands):

2014
               $ 4,266   
2015
                  3,958   
2016
                  3,307   
2017
                  2,399   
2018
                  1,769   
Thereafter
                  2,007   
 
               $ 17,706