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Description Of Business And Summary Of Significant Accounting Policies - Cumulative effects of foreign currency exchange rate fluctuations (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2013
Jan. 31, 2012
Jul. 31, 2012
Cumulative Translation Adjustment Summary [Roll Forward]          
Cumulative loss on foreign currency translation, Begining balance     $ (34,933) $ (23,225) $ (23,225)
Gain (Loss) on foreign currency translation (2,109) (6,114) 4,953 (9,614) (11,708)
Cumulative loss on foreign currency translation, Ending balance $ (29,980)   $ (29,980)   $ (34,933)