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Goodwill and Intangible Assets (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 31, 2012	Jul. 31, 2011
Amortized intangibles:
Accumulated amortization	$ (28,236)	$ (26,723)
Net intangibles	10,184	12,748
Goodwill [Roll Forward]
Balance	198,620
Effect of foreign currency exchange rates	(3,666)
Balance	194,954
Covenants not to compete
Amortized intangibles:
Intangibles, gross	11,077	10,896
Supply contracts
Amortized intangibles:
Intangibles, gross	26,020	27,238
Licenses and databases
Amortized intangibles:
Intangibles, gross	$ 1,323	$ 1,337

X

- Definition

The accumulated amount of amortization of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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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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