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Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Trading and Available-for-sale Investments by Balance Sheet Classification) (Details) - USD ($)
$ in Thousands
May 31, 2017
Nov. 30, 2016
May 31, 2016
Nov. 30, 2015
Cash, Cash Equivalents and Investments [Line Items]        
Cash and Equivalents $ 197,886 $ 207,036 $ 179,733 $ 212,379
Short-Term Investments 47,196 42,718    
State and municipal bond obligations [Member]        
Cash, Cash Equivalents and Investments [Line Items]        
Cash and Equivalents 0 0    
Short-Term Investments 37,206 32,724    
U.S. treasury bonds [Member]        
Cash, Cash Equivalents and Investments [Line Items]        
Cash and Equivalents 0 0    
Short-Term Investments 5,652 6,513    
Corporate bonds [Member]        
Cash, Cash Equivalents and Investments [Line Items]        
Cash and Equivalents 0 0    
Short-Term Investments 4,338 3,481    
Cash [Member]        
Cash, Cash Equivalents and Investments [Line Items]        
Cash and Equivalents 191,940 196,863    
Short-Term Investments 0 0    
Money market funds [Member]        
Cash, Cash Equivalents and Investments [Line Items]        
Cash and Equivalents 5,946 10,173    
Short-Term Investments $ 0 $ 0