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Cash, Cash Equivalents and Investments (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Aug. 31, 2014 | Aug. 31, 2014 | Aug. 31, 2013 | Nov. 30, 2013
Cash, Cash Equivalents and Investments [Line Items] |  |  |  |
Redemptions and sales of auction rate securities |  | $ 26,196,000 | $ 25,000 |
Loss on sale of auction rate securities | 2,600,000 |  |  |
Investments in auction rate securities | 0 | 0 |  | 24,761,000
Unrealized Losses | 0 | 0 |  | 3,989,000
Auction Rate Securities [Member] |  |  |  |
Cash, Cash Equivalents and Investments [Line Items] |  |  |  |
Investments in auction rate securities |  |  |  | 24,800,000
Unrealized Losses |  |  |  | $ 4,000,000
Percentage of par value to be received after renouncing claim |  |  |  | 80.00%
Percentage of par to be received if insurance rights retained |  |  |  | 65.00%
Percentage of par value received on investment |  |  |  | 80.00%

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- Definition Available-for-sale Securities, Percentage of Par Value Received after Renouncing Claim + References No definition available. + Details
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- Details
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- Definition Redemptions Of Auction Rate Securities Available For Sale. + References No definition available. + Details
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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity 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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- 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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