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Net Earnings Per Share (Tables)
6 Months Ended
Feb. 29, 2012
Net Earnings Per Share [Abstract]  
Schedule Of Anti-Dilutive Securities Excluded From Computation Of Earnings Per Share
  Three months ended Six months ended
  February 29, February 28, February 29, February 28,
  2012 2011 2012 2011
Restricted stock units 2,119 - 6,483 4,125
Stock options 36,079 - 24,222 -