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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Oct. 31, 2014
Goodwill and Intangible Assets [Abstract]  
Schedule of aggregate amortization expense on intangible assets
(In thousands) October 31, 2014 July 31, 2014
Amortized intangibles:        
Covenants not to compete $14,642  $13,660 
Supply contracts & customer relationships  46,467   50,757 
Trade name  5,662   2,757 
Licenses and databases  2,594   2,560 
Accumulated amortization  (45,106)  (44,492)
Net intangibles $24,259  $25,242
Schedule of change in carrying amount of goodwill
Balance as of July 31, 2014$283,780 
Adjustments to preliminary purchase price allocation (985)
Effect of foreign currency exchange rates (5,906)
Balance as of October 31, 2014$276,889