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NET INCOME PER COMMON SHARE: (Antidilutive Securities) (Details) (Options [Member])
In Thousands, unless otherwise specified
12 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Nov. 30, 2009
Options [Member]
     
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Options excluded from computation of diluted net income per share 47 53 205