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DEFERRED COMPENSATION PLAN: (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Nov. 30, 2012
years
Nov. 30, 2011
Nov. 30, 2010
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Minimum age requirement for distribution (in years) 65    
Deferred Compensation Maximum Payment Period 15 years    
Early distribution, other than hardship, withdrawal penalty 10.00%    
Deferred compensation liability balances $ 13,870 $ 13,872  
Gain (Loss) on Investments 2,898 (1,334) 104
Equity Securities, Hedge Funds and Private Equity Funds [Member]
     
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Deferred compensation liability balances 7,593 8,137  
Gain (Loss) on Investments $ 2,585 $ (1,101) $ 176