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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 | 12 Months Ended |
--- | --- | ---
Nov. 30, 2013 | May 31, 2014
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | $ 260,406 | $ 255,191
Realized Losses | (380) |
Unrealized Gains | 164 | 135
Unrealized Losses | (3,989) | (3,694)
Fair Value | 256,201 | 251,632
State and municipal bond obligations [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 30,938 | 24,470
Realized Losses | 0 |
Unrealized Gains | 164 | 135
Unrealized Losses | 0 | 0
Fair Value | 31,102 | 24,605
Auction rate securities - municipal bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 27,150 | 25,250
Realized Losses | (380) |
Unrealized Gains | 0 | 0
Unrealized Losses | (3,317) | (3,063)
Fair Value | 23,453 | 22,187
Auction rate securities - student loans [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 3,500 | 3,500
Realized Losses | 0 |
Unrealized Gains | 0 | 0
Unrealized Losses | (672) | (631)
Fair Value | 2,828 | 2,869
Cash [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 144,305 | 127,279
Fair Value | 144,305 | 127,279
Money market funds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 54,513 | 74,692
Fair Value | $ 54,513 | $ 74,692

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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 No definition available. + Details
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X
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition Cash, Cash Equivalents, And Investments, Cost Basis. + References No definition available. + Details
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- Definition Fair value of cash, cash equivalent and investements + References No definition available. + Details
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- Definition This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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