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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 9 Months Ended
May 31, 2012
May 31, 2011
May 31, 2012
May 31, 2011
Comprehensive Income [Abstract]        
Net earnings $ 18,823 $ 15,289 $ 34,518 $ 30,900
Defined benefit pension plan adjustment, net of tax 26 [1] 26 [1] 77 [1] 76 [1]
Unrealized gain on cash flow hedges, net of tax 57 [1] 63 [1] 177 [1] 244 [1]
Foreign currency translation adjustment, net of hedging activities (4,599) [1] 1,853 [1] (7,386) [1] 4,666 [1]
Total comprehensive income 14,307 17,231 27,386 35,886
Other comprehensive income, tax expense $ 530 $ 215 $ 885 $ 394
[1] Net of tax expense of $530 and $885 for the three months and nine months ended May 31, 2012, respectively. Net of tax expense of $215 and $394 for the three months and nine months ended May 31, 2011, respectively.