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Cash, Cash Equivalents and Investments (Fair Value of Debt Securities by Contractual Maturity) (Details) (USD $) In Thousands, unless otherwise specified |  |  | 6 Months Ended
--- | --- | --- | ---
May 31, 2014 | Nov. 30, 2013 | May 31, 2014 Minimum [Member] | May 31, 2014 Maximum [Member]
Cash, Cash Equivalents and Investments [Line Items] |  |  |  |  |  |
Due in one year or less | $ 39,943 | [1] | $ 42,198 | [1] |  |
Due after one year | 9,718 | [2] | 15,185 | [2] |  |
Total | $ 49,661 |  | $ 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.

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