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Restructuring (Details) (Severance, USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jan. 31, 2012
Severance
 
Restructuring Reserve [Roll Forward]  
Balance at July 31, 2011 $ 1,051
Expense 1,102
Payments 201
Balance at January 31, 2012 $ 1,952