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FINANCIAL INSTRUMENTS AND RISK MANAGEMENT (Details 5)
1 Months Ended 3 Months Ended
Feb. 28, 2013
USD ($)
Feb. 29, 2012
USD ($)
Feb. 28, 2011
USD ($)
Feb. 28, 2010
USD ($)
Feb. 28, 2013
Venezuela
VEF
Feb. 28, 2013
Venezuela
USD ($)
Feb. 28, 2013
Cash, interest and non-interest-bearing accounts - unrestricted
USD ($)
Feb. 29, 2012
Cash, interest and non-interest-bearing accounts - unrestricted
USD ($)
Feb. 28, 2013
Cash, interest and non-interest-bearing accounts - unrestricted
Minimum
Feb. 29, 2012
Cash, interest and non-interest-bearing accounts - unrestricted
Minimum
Feb. 28, 2013
Cash, interest and non-interest-bearing accounts - unrestricted
Maximum
Feb. 29, 2012
Cash, interest and non-interest-bearing accounts - unrestricted
Maximum
Feb. 28, 2013
Cash, interest and non-interest-bearing accounts - restricted
USD ($)
Feb. 29, 2012
Cash, interest and non-interest-bearing accounts - restricted
USD ($)
Feb. 28, 2013
Cash, interest and non-interest-bearing accounts - restricted
Venezuela
USD ($)
Feb. 29, 2012
Cash, interest and non-interest-bearing accounts - restricted
Venezuela
USD ($)
Feb. 28, 2013
Cash, interest and non-interest-bearing accounts - restricted
Minimum
Feb. 29, 2012
Cash, interest and non-interest-bearing accounts - restricted
Minimum
Feb. 28, 2013
Cash, interest and non-interest-bearing accounts - restricted
Maximum
Feb. 29, 2012
Cash, interest and non-interest-bearing accounts - restricted
Maximum
Feb. 28, 2013
Money market funds
USD ($)
Feb. 29, 2012
Money market funds
USD ($)
Feb. 28, 2013
Money market funds
Minimum
Feb. 29, 2012
Money market funds
Minimum
Feb. 28, 2013
Money market funds
Maximum
Feb. 29, 2012
Money market funds
Maximum
CASH AND CASH EQUIVALENTS                                                    
Cash and cash equivalents $ 12,842,000 $ 21,846,000 $ 27,193,000 $ 110,208,000     $ 9,568,000 $ 18,375,000                         $ 1,091,000 $ 801,000        
Cash, interest and non-interest-bearing accounts - restricted                         2,183,000 2,670,000 2,180,000 2,670,000                    
Total cash and cash equivalents 12,842,000 21,846,000                                                
Interest rates (as a percent)                 0.00% 0.00% 1.30% 1.70%         0.00% 0.00% 0.75% 1.25%     0.35% 0.53% 0.37% 4.32%
Value of foreign currency before devaluation (in Bolivars per dollar)         4.30                                          
Value of foreign currency after devaluation (in dollars per Bolivar)         6.30                                          
Impact of unfavorable foreign exchange rate           $ (1,410,000)