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DEFERRED COMPENSATION PLAN: (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Nov. 30, 2013
Nov. 30, 2012
Nov. 30, 2011
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]      
Minimum age requirement for distribution (in years) 65    
Early distribution, other than hardship, withdrawal penalty 10.00%    
Deferred compensation liability balances $ 13,013 $ 13,870  
Gain (Loss) on Investments 1,058 2,898 (1,334)
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 6,381 7,593  
Gain (Loss) on Investments $ 1,868 $ 2,585 $ (1,101)