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Employee Benefit Plans - Schedule of Amounts Recognized in Balance Sheet (Details) (USD $)
In Thousands, unless otherwise specified
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Compensation and Retirement Disclosure [Abstract]      
Current liability $ 677 $ 716  
Noncurrent liability 12,346 13,509  
Defined Benefit Plan, Benefit Obligation $ 13,023 $ 14,225 $ 15,011