Short-Term Borrowings (Details) (Wells Fargo Bank NA, USD $)	12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013
Wells Fargo Bank NA
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 25,000,000
Line of Credit Facility, Expiration Date	Mar. 01, 2015
Short-term Debt, Weighted Average Interest Rate		2.10%
Line of Credit Facility, Amount Outstanding	$ 0	$ 9,000,000