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BORROWINGS: (Future Minimum Payments, Interest Expense) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
May 31, 2014
May 31, 2013
May 31, 2014
May 31, 2013
Nov. 30, 2013
May 31, 2008
Interest Expense, Debt [Abstract]            
Interest Expense, Debt $ 6,708 $ 5,757 $ 12,301 $ 12,313    
Non-cash debt accretion expense     0 2,314    
Convertible senior notes stated interest rate           4.00%
Long-term Debt, Fiscal Year Maturity [Abstract]            
Fiscal year 2014 691,337   691,337      
Fiscal Year 2015 12,103   12,103      
Fiscal Year 2016 17,672   17,672      
Fiscal Year 2017 82,275   82,275      
Fiscal Year 2018 169,619   169,619      
Thereafter 3,343   3,343      
Outstanding borrowings 976,349   976,349   317,928  
Minimum [Member]
           
Interest Expense, Debt [Abstract]            
Debt, Variable Interest Percentage, Percentage Rate 0.61% 0.67% 0.61% 0.67%    
Maximum [Member]
           
Interest Expense, Debt [Abstract]            
Debt, Variable Interest Percentage, Percentage Rate 4.25% 3.43% 4.25% 3.53%    
Convertible Debt [Member]
           
Interest Expense, Debt [Abstract]            
Interest Expense, Debt   1,387   3,011    
Non-cash debt accretion expense   $ 926   $ 2,314    
Convertible senior notes stated interest rate           4.00%