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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	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	$ 105,126	$ 133,464	$ 207,036	$ 212,379
Short-Term Investments	34,387	50,145
State and municipal bond obligations
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	19,423	40,227
U.S. treasury bonds
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	6,705	3,491
Corporate bonds
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	8,259	6,427
Cash
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	101,316	130,547
Money market funds
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	$ 3,810	$ 2,917

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Cash Cash Equivalents And Investments [Line Items]

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of investments including trading securities, available-for-sale securities, held-to-maturity securities, and short-term investments classified as other and current.

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