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Fair Value Measurements (Details Textual) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 9 Months Ended 6 Months Ended 9 Months Ended
Apr. 30, 2012
Apr. 30, 2012
Jul. 31, 2011
Apr. 30, 2012
North South Asia Reporting Unit [Member]
Jan. 31, 2012
Asia-Pacific [Member]
Apr. 30, 2012
Asia-Pacific [Member]
Jul. 31, 2011
Asia-Pacific [Member]
Goodwill [Line Items]              
Goodwill, carrying amount $ 666,423 $ 666,423 $ 800,343 $ 163,702   $ 84,310 $ 203,527
Estimated implied fair value       48,014      
Impairment charge    115,688     115,688 115,688  
Fair Value Measurements (Textual) [Abstract]              
Long Term Debt Obligation at Fair Value 363,616 363,616 416,694        
Long Term Debt Obligation at Carrying Value $ 342,076 $ 342,076 $ 393,178