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Earnings Per Share (Calculation of Basic and Diluted Income Per Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Feb. 28, 2015
Mar. 01, 2014
Feb. 28, 2015
Mar. 01, 2014
Earnings Per Share [Abstract]        
Net income $ 8,096us-gaap_NetIncomeLoss $ 9,593us-gaap_NetIncomeLoss $ 17,991us-gaap_NetIncomeLoss $ 20,739us-gaap_NetIncomeLoss
Weighted average shares outstanding 26,924us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 27,595us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 26,946us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 27,723us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Net income per share - basic (in dollars per share) $ 0.30us-gaap_EarningsPerShareBasic $ 0.35us-gaap_EarningsPerShareBasic $ 0.67us-gaap_EarningsPerShareBasic $ 0.75us-gaap_EarningsPerShareBasic
Dilutive impact of awards and options outstanding 94us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 129us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 102us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 127us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average shares and potential dilutive shares outstanding 27,018us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,724us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,048us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 27,850us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Net income per share - assuming dilution (in dollars per share) $ 0.30us-gaap_EarningsPerShareDiluted $ 0.35us-gaap_EarningsPerShareDiluted $ 0.67us-gaap_EarningsPerShareDiluted $ 0.74us-gaap_EarningsPerShareDiluted