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Condensed Consolidated Statements Of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Nov. 30, 2012
Nov. 30, 2011
Statement of Other Comprehensive Income [Abstract]    
Net earnings $ 14,728 $ 2,921
Defined benefit pension plan adjustment, net of tax 33 26
Unrealized gain on cash flow hedges, net of tax 26 72
Foreign currency translation adjustment, net of hedging activities, net of tax (41) (4,131)
Total other comprehensive income (loss), net of tax (benefit) expense of ($393), $139 18 (4,033)
Total comprehensive income $ 14,746 $ (1,112)