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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 | Aug. 31, 2014 | Nov. 30, 2013 | Aug. 31, 2013 | Nov. 30, 2012
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Cash, Cash Equivalents and Investments [Line Items] |  |  |  |
Cash and Equivalents | $ 242,380 | $ 198,818 | $ 215,342 | $ 301,792
Short-Term Investments | 18,912 | 32,622 |  |
Long-Term Investments | 0 | 24,761 |  |
State and municipal bond obligations [Member] |  |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |  |
Short-Term Investments | 18,912 | 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 | 0 | 21,933 |  |
Auction rate securities - student loans [Member] |  |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |  |
Short-Term Investments | 0 | 0 |  |
Long-Term Investments | 0 | 2,828 |  |
Cash [Member] |  |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |  |
Cash and Equivalents | 173,237 | 144,305 |  |
Money market funds [Member] |  |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |  |
Cash and Equivalents | $ 69,143 | $ 54,513 |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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- Definition The total amount of investments that are intended to be held for an extended period of time (longer than one operating cycle). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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