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Cash, Cash Equivalents and Investments (Summary Of Cash, Cash Equivalents And Trading And Available-For-Sale Investments) (Details) (USD $) In Thousands, unless otherwise specified | Aug. 31, 2013 | Nov. 30, 2012
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Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | $ 272,496 | $ 385,640
Unrealized Gains | 137 | 255
Unrealized Losses | (4,078) | (4,357)
Fair Value | 268,555 | 381,538
Cash [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 156,428 | 176,201
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 156,428 | 176,201
Money market funds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 58,914 | 125,591
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 58,914 | 125,591
State and municipal bond obligations [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 26,504 | 50,565
Unrealized Gains | 137 | 255
Unrealized Losses | (1) | (2)
Fair Value | 26,640 | 50,818
Auction rate securities - municipal bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 27,150 | 27,175
Unrealized Gains | 0 | 0
Unrealized Losses | (3,443) | (3,755)
Fair Value | 23,707 | 23,420
Auction rate securities - student loans [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 3,500 | 3,500
Unrealized Gains | 0 | 0
Unrealized Losses | (634) | (599)
Fair Value | 2,866 | 2,901
Corporate bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis |  | 2,608
Unrealized Gains |  | 0
Unrealized Losses |  | (1)
Fair Value |  | $ 2,607

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- Definition This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 133 -Paragraph 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 13, 19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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