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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2012	Jul. 31, 2011
Amortized intangibles:
Accumulated amortization	$ (30,003)	$ (26,723)
Net intangibles	9,375	12,748
Goodwill [Roll Forward]
Balance as of July 31, 2011	198,620
Effect of foreign currency exchange rates	(812)
Balance as of April 30, 2012	197,808
Covenants not to compete
Amortized intangibles:
Finite-Lived Intangible Assets, Gross	11,077	10,896
Supply contracts
Amortized intangibles:
Finite-Lived Intangible Assets, Gross	26,968	27,238
Licenses and databases
Amortized intangibles:
Finite-Lived Intangible Assets, Gross	$ 1,333	$ 1,337

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Carrying amount as of the balance sheet date, which is the cumulative amount paid and (if applicable) the fair value of any noncontrolling interest in the acquiree, adjusted for any amortization recognized prior to the adoption of any changes in generally accepted accounting principles (as applicable) and for any impairment charges, in excess of the fair value of net assets acquired in one or more business combination transactions.

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