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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
--- | --- | --- | ---
Aug. 31, 2013 | Nov. 30, 2012 | Aug. 31, 2013 Minimum [Member] | Aug. 31, 2013 Maximum [Member]
Cash, Cash Equivalents and Investments [Line Items] |  |  |  |  |  |
Due in one year or less | $ 39,011 | [1] | $ 55,001 | [1] |  |
Due after one year | 14,202 |  | 24,745 |  |  |
Total | $ 53,213 |  | $ 79,746 |  |  |
Remaining contractual maturity of investments (in years) |  |  |  |  | 11 years | 30 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 11 to 30 years.

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