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Goodwill and Intangible Assets (Tables)
 9 Months Ended
Apr. 30, 2014
Goodwill and Intangible Assets [Abstract]  
Schedule of aggregate amortization expense on intangible assets
(In thousands)   April 30, 2014   July 31, 2013
Amortized intangibles:                
Covenants not to compete   $ 17,655     $ 12,515  
Supply contracts     28,953       26,322  
Customer relationships     15,834       7,389  
Trade name     2,540       2,998  
Licenses and databases     2,113       3,306  
Accumulated amortization     (41,711 )     (34,824 )
Net intangibles   $ 25,384     $ 17,706  
Schedule of change in carrying amount of goodwill
 
Balance as of July 31, 2013   $ 267,463  

Goodwill recorded during the period (Note 13 - Acquisitions)

     12,987  
Effect of foreign currency exchange rates     7,952  
Balance as of April 30, 2014   $ 288,402