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Cash, Cash Equivalents and Investments (Fair Value of Debt Securities by Contractual Maturity) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Feb. 28, 2014
Nov. 30, 2013
Feb. 28, 2014
Minimum [Member]
Feb. 28, 2014
Maximum [Member]
Cash, Cash Equivalents and Investments [Line Items]        
Due in one year or less $ 41,899 [1] $ 42,198 [1]    
Due after one year 11,904 [2] 15,185 [2]    
Total $ 53,803 $ 57,383    
Remaining contractual maturity of investments     10 years 29 years
[1] Includes ARS which are tendered for interest-rate setting purposes periodically throughout the year. Beginning in February 2008, auctions for these securities began to fail, and therefore these investments currently lack short-term liquidity. The remaining contractual maturities of these securities range from 10 to 29 years.
[2] Includes state and municipal bond obligations, which are securities representing investments available for current operations and are classified as current in the consolidated balance sheets.