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Comprehensive Income (Schedule Of Difference Between The Reported Net Earnings And Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 29, 2012
Feb. 28, 2011
Comprehensive Income [Abstract]        
Net earnings $ 12,774 $ 11,325 $ 15,695 $ 15,611
Defined benefit pension plan, net of tax 25 [1] 25 [1] 51 [1] 50 [1]
Unrealized gain on cash flow hedges, net of tax 48 [1] 79 [1] 120 [1] 181 [1]
Foreign currency translation, net of hedging activities 1,344 [1] 2,069 [1] (2,787) [1] 2,813 [1]
Total comprehensive income 14,191 13,498 13,079 18,655
Other comprehensive income, tax expense $ 216 $ 256 $ 355 $ 179
[1] Net of tax expense of $216 and $355 for the three months and six months ended February 29, 2012, respectively. Net of tax expense of $256 and $179 for the three months and six months ended February 28, 2011, respectively.