v3.3.1.900
CONVERTIBLE DEBT: (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2013
USD ($)
May. 31, 2008
$ / shares
Nov. 30, 2015
USD ($)
Nov. 30, 2014
USD ($)
Nov. 30, 2013
USD ($)
Debt Instrument [Line Items]          
Convertible debt principal amount $ 143,750        
Repayments of convertible debt     $ 0 $ 0 $ 218,870
Conversion premium         75,120
Non-cash interest expense     $ 0 $ 0 2,314
Convertible Debt [Member]          
Debt Instrument [Line Items]          
Convertible debt principal amount 143,750        
Stated percentage of convertible senior notes   4.00%      
Conversion ratio   33.9945      
Conversion price per share | $ / shares   $ 29.42      
Repayments of convertible debt 218,870        
Repayment of debt principal 143,750        
Conversion premium $ 75,120        
Contractual interest expense         $ 3,010
Effective borrowing rate         8.00%
Non-cash interest expense         $ 2,314