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Condensed Consolidated Statements Of Comprehensive Income (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]        
Net earnings $ 19,351 $ 12,774 $ 34,079 $ 15,695
Defined benefit pension plan adjustment, net of tax 33 25 66 51
Unrealized (loss) gain on cash flow hedges, net of tax (35) 48 (9) 120
Foreign currency translation adjustment, net of hedging activitie and tax 1,148 1,344 1,107 (2,787)
Total other comprehensive income (loss), net of tax expense (benefit) of $275, $216, ($118) and $355 1,146 1,417 1,164 (2,616)
Total comprehensive income $ 20,497 $ 14,191 $ 35,243 $ 13,079