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Condensed Consolidated Statements Of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Feb. 28, 2013
Feb. 29, 2012
Feb. 28, 2013
Feb. 29, 2012
Statement of Other Comprehensive Income [Abstract]        
Other comprehensive income, tax (benefit) expense $ 275 $ 216 $ (118) $ 355