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Cash, Cash Equivalents and Investments (Tables) | 9 Months Ended
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Aug. 31, 2013
Investments and Cash [Abstract] |
Summary of Cash, Cash Equivalents and Trading and Available-for-sale Investments | A summary of our cash, cash equivalents and available-for-sale investments at August 31, 2013 is as follows (in thousands):
| Amortized Cost Basis |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Cash | $ | 156,428 |  |  | $ | — |  |  | $ | — |  |  | $ | 156,428 |
Money market funds | 58,914 |  |  | — |  |  | — |  |  | 58,914 |
State and municipal bond obligations | 26,504 |  |  | 137 |  |  | (1 | ) |  | 26,640 |
Auction rate securities – municipal bonds | 27,150 |  |  | — |  |  | (3,443 | ) |  | 23,707 |
Auction rate securities – student loans | 3,500 |  |  | — |  |  | (634 | ) |  | 2,866 |
Total | $ | 272,496 |  |  | $ | 137 |  |  | $ | (4,078 | ) |  | $ | 268,555 |
A summary of our cash, cash equivalents and available-for-sale investments at November 30, 2012 is as follows (in thousands):
| Amortized Cost Basis |  | Unrealized Gains |  | Unrealized Losses |  | Fair Value
Cash | $ | 176,201 |  |  | $ | — |  |  | $ | — |  |  | $ | 176,201 |
Money market funds | 125,591 |  |  | — |  |  | — |  |  | 125,591 |
State and municipal bond obligations | 50,565 |  |  | 255 |  |  | (2 | ) |  | 50,818 |
Auction rate securities – municipal bonds | 27,175 |  |  | — |  |  | (3,755 | ) |  | 23,420 |
Auction rate securities – student loans | 3,500 |  |  | — |  |  | (599 | ) |  | 2,901 |
Corporate bonds | 2,608 |  |  | — |  |  | (1 | ) |  | 2,607 |
Total | $ | 385,640 |  |  | $ | 255 |  |  | $ | (4,357 | ) |  | $ | 381,538 |
Summary of Cash, Cash Equivalents and Trading and Available-for-sale Investments by Balance Sheet Classification | Such amounts are classified on our condensed consolidated balance sheets as follows (in thousands):
| August 31, 2013 |  | November 30, 2012
| Cash and Equivalents |  | Short-Term Investments |  | Long-Term Investments |  | Cash and Equivalents |  | Short-Term Investments |  | Long-Term Investments
Cash | $ | 156,428 |  |  | $ | — |  |  | $ | — |  |  | $ | 176,201 |  |  | $ | — |  |  | $ | — |
Money market funds | 58,914 |  |  | — |  |  | — |  |  | 125,591 |  |  | — |  |  | — |
State and municipal bond obligations | — |  |  | 26,640 |  |  | — |  |  | — |  |  | 50,818 |  |  | — |
Auction rate securities – municipal bonds | — |  |  | — |  |  | 23,707 |  |  | — |  |  | — |  |  | 23,420 |
Auction rate securities – student loans | — |  |  | — |  |  | 2,866 |  |  | — |  |  | — |  |  | 2,901 |
Corporate bonds | — |  |  | — |  |  | — |  |  | — |  |  | 2,607 |  |  | — |
Total | $ | 215,342 |  |  | $ | 26,640 |  |  | $ | 26,573 |  |  | $ | 301,792 |  |  | $ | 53,425 |  |  | $ | 26,321 |
Fair Value of Debt Securities by Contractual Maturity | The fair value of debt securities by contractual maturity is as follows (in thousands):
| August 31, 2013 |  | November 30, 2012
Due in one year or less (1) | $ | 39,011 |  |  | $ | 55,001 |
Due after one year | 14,202 |  |  | 24,745 |
Total | $ | 53,213 |  |  | $ | 79,746 |
(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.
Investments with Continuous Unrealized Losses and Their Related Fair Values | Investments with continuous unrealized losses and their related fair values are as follows at August 31, 2013 (in thousands):
| Less Than 12 Months |  | 12 Months or Greater |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
State and municipal bond obligations | $ | 956 |  |  | $ | (1 | ) |  | $ | — |  |  | $ | — |  |  | $ | 956 |  |  | $ | (1 | )
Auction rate securities – municipal bonds | — |  |  | — |  |  | 23,707 |  |  | (3,443 | ) |  | 23,707 |  |  | (3,443 | )
Auction rate securities – student loans | — |  |  | — |  |  | 2,866 |  |  | (634 | ) |  | 2,866 |  |  | (634 | )
Total | $ | 956 |  |  | $ | (1 | ) |  | $ | 26,573 |  |  | $ | (4,077 | ) |  | $ | 27,529 |  |  | $ | (4,078 | )
Investments with continuous unrealized losses and their related fair values are as follows at November 30, 2012 (in thousands):
| Less Than 12 Months |  | 12 Months or Greater |  | Total
| Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses |  | Fair Value |  | Unrealized Losses
State and municipal bond obligations | $ | 5,818 |  |  | $ | (1 | ) |  | $ | 472 |  |  | $ | (1 | ) |  | $ | 6,290 |  |  | $ | (2 | )
Auction rate securities – municipal bonds | — |  |  | — |  |  | 23,420 |  |  | (3,755 | ) |  | 23,420 |  |  | (3,755 | )
Auction rate securities – student loans | — |  |  | — |  |  | 2,901 |  |  | (599 | ) |  | 2,901 |  |  | (599 | )
Corporate bonds | 2,607 |  |  | (1 | ) |  | — |  |  | — |  |  | 2,607 |  |  | (1 | )
Total | $ | 8,425 |  |  | $ | (2 | ) |  | $ | 26,793 |  |  | $ | (4,355 | ) |  | $ | 35,218 |  |  | $ | (4,357 | )

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