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Short-Term Borrowings (Details) - Wells Fargo Bank NA - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Line of Credit Facility [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 25,000  
Line of Credit Facility, Expiration Date Apr. 01, 2016  
Line of Credit Facility, Amount Outstanding $ 0 $ 0