Fair Value Measurements (Details Textual) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jan. 31, 2012	Jan. 31, 2012	Jul. 31, 2011
Goodwill [Line Items]
Goodwill, carrying amount	$ 666,907	$ 666,907	$ 800,343
Non-cash estimated impairment charge	115,688	115,688
Fair Value Measurements (Textual) [Abstract]
Long Term Debt Obligation at Fair Value	408,431	408,431	416,694
Long Term Debt Obligation at Carrying Value	384,335	384,335	393,178
North South Asia Reporting Unit [Member]
Goodwill [Line Items]
Goodwill, carrying amount	163,702	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

- Definition

Including current and noncurrent portions, aggregate carrying amount of long-term borrowings as of the balance sheet date. May include notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, which had initial maturities beyond one year or beyond the normal operating cycle, if longer, and after deducting unamortized discount or premiums, if any.

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