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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 | May. 31, 2015 | Nov. 30, 2014
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Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | $ 199,070 | $ 283,182
Unrealized Gains | 63 | 86
Unrealized Losses | (12) | 0
Fair Value | 199,121 | 283,268
State and municipal bond obligations [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 33,050 | 20,100
Unrealized Gains | 63 | 86
Unrealized Losses | (12) | 0
Fair Value | 33,101 | 20,186
Cash [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 144,175 | 195,189
Fair Value | 144,175 | 195,189
Money market funds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 21,845 | 67,893
Fair Value | $ 21,845 | $ 67,893

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: 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=27724398&loc=d3e27161-111563 + Details
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