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Consolidated Balance Sheets (Parenthetical) (USD $)
Nov. 30, 2014
Aug. 31, 2014
Preferred stock, without par value      
Preferred stock, shares authorized 25,000,000us-gaap_PreferredStockSharesAuthorized 25,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, outstanding      
Common stock, without par value      
Common stock, shares authorized 50,000,000us-gaap_CommonStockSharesAuthorized 50,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares outstanding 26,890,000us-gaap_CommonStockSharesOutstanding 27,364,000us-gaap_CommonStockSharesOutstanding