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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, unless otherwise specified
Feb. 28, 2014
Nov. 30, 2013
Feb. 28, 2013
Nov. 30, 2012
Cash, Cash Equivalents and Investments [Line Items]        
Cash and Equivalents $ 219,356 $ 198,818 $ 279,217 $ 301,792
Short-Term Investments 28,693 32,622    
Long-Term Investments 25,110 24,761    
State and municipal bond obligations [Member]
        
Cash, Cash Equivalents and Investments [Line Items]        
Short-Term Investments 28,693 31,102    
Long-Term Investments 0 0    
Auction rate securities - municipal bonds [Member]
        
Cash, Cash Equivalents and Investments [Line Items]        
Short-Term Investments 0 1,520    
Long-Term Investments 22,233 21,933    
Auction rate securities - student loans [Member]
        
Cash, Cash Equivalents and Investments [Line Items]        
Short-Term Investments 0 0    
Long-Term Investments 2,877 2,828    
Cash [Member]
        
Cash, Cash Equivalents and Investments [Line Items]        
Cash and Equivalents 160,799 144,305    
Money market funds [Member]
        
Cash, Cash Equivalents and Investments [Line Items]        
Cash and Equivalents $ 58,557 $ 54,513