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Note 11 - Common Stock and Earnings Per Share (Details) - Weighted Average Shares Outstanding (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Basic EPS    
Net Income (Numerator) (in Dollars) $ 55,860us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 52,178us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted Average Common Shares (Denominator) 41,683us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 43,134us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Per Share Amount (in Dollars per share) $ 1.34us-gaap_EarningsPerShareBasic $ 1.21us-gaap_EarningsPerShareBasic
Diluted EPS    
Weighted Average Common Shares (Denominator) 657us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares 639us-gaap_IncrementalCommonSharesAttributableToContingentlyIssuableShares
Net Income (Numerator) (in Dollars) $ 55,860us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 52,178us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Weighted Average Common Shares (Denominator) 42,340us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 43,773us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Per Share Amount (in Dollars per share) $ 1.32us-gaap_EarningsPerShareDiluted $ 1.19us-gaap_EarningsPerShareDiluted