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Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Trading and Available-for-sale Investments by Balance Sheet Classification) (Details) (USD $)
In Thousands, unless otherwise specified |
May 31, 2014
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Nov. 30, 2013
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May 31, 2013
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Nov. 30, 2012
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|---|---|---|---|---|
| Cash, Cash Equivalents and Investments [Line Items] | ||||
| Cash and Equivalents | $ 201,971 | $ 198,818 | $ 218,387 | $ 301,792 |
| Short-Term Investments | 24,605 | 32,622 | ||
| Long-Term Investments | 25,056 | 24,761 | ||
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State and municipal bond obligations [Member]
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| Cash, Cash Equivalents and Investments [Line Items] | ||||
| Short-Term Investments | 24,605 | 31,102 | ||
| Long-Term Investments | 0 | 0 | ||
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Auction rate securities - municipal bonds [Member]
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| Cash, Cash Equivalents and Investments [Line Items] | ||||
| Short-Term Investments | 0 | 1,520 | ||
| Long-Term Investments | 22,187 | 21,933 | ||
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Auction rate securities - student loans [Member]
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| Cash, Cash Equivalents and Investments [Line Items] | ||||
| Short-Term Investments | 0 | 0 | ||
| Long-Term Investments | 2,869 | 2,828 | ||
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Cash [Member]
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| Cash, Cash Equivalents and Investments [Line Items] | ||||
| Cash and Equivalents | 127,279 | 144,305 | ||
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Money market funds [Member]
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| Cash, Cash Equivalents and Investments [Line Items] | ||||
| Cash and Equivalents | $ 74,692 | $ 54,513 |