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Cash, Cash Equivalents and Investments (Investments with Continuous Unrealized Losses and Their Related Fair Values) (Details) (USD $) In Thousands, unless otherwise specified | Feb. 28, 2014 | Nov. 30, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | $ 0 | $ 0
Unrealized Losses, Less Than 12 Months | 0 | 0
Fair Value, 12 Months or Greater | 25,110 | 24,761
Unrealized Losses, 12 Months or Greater | (3,640) | (3,989)
Total, Fair Value | 25,110 | 24,761
Total, Unrealized Losses | (3,640) | (3,989)
Auction rate securities - municipal bonds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | 0 | 0
Unrealized Losses, Less Than 12 Months | 0 | 0
Fair Value, 12 Months or Greater | 22,233 | 21,933
Unrealized Losses, 12 Months or Greater | (3,017) | (3,317)
Total, Fair Value | 22,233 | 21,933
Total, Unrealized Losses | (3,017) | (3,317)
Auction rate securities - student loans [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair Value, Less Than 12 Months | 0 | 0
Unrealized Losses, Less Than 12 Months | 0 | 0
Fair Value, 12 Months or Greater | 2,877 | 2,828
Unrealized Losses, 12 Months or Greater | (623) | (672)
Total, Fair Value | 2,877 | 2,828
Total, Unrealized Losses | $ (623) | $ (672)

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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References No definition available. + Details
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- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are 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 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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