Fair Value Measurements (Details Textual) (USD $) In Thousands, unless otherwise specified				12 Months Ended
Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2012 North South Asia Reporting Unit [Member]
Fair Value Measurements (Textual) [Abstract]
Goodwill, carrying amount	$ 676,791	$ 800,343	$ 768,600	$ 163,702
Estimated implied fair value				48,014
Non-cash estimated impairment charge				$ 115,688

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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+ Details

- Definition

Loss recognized during the period that results from the write-down of goodwill after comparing the implied fair value of reporting unit goodwill with the carrying amount of that goodwill. Goodwill is assessed at least annually for impairment.

+ References

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+ Details