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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	Feb. 28, 2017	Nov. 30, 2016	Nov. 30, 2015	Feb. 28, 2015
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	$ 226,907	$ 207,036	$ 212,379	$ 203,704
Short-Term Investments	37,285	42,718
State and municipal bond obligations [Member]
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	0	0
Short-Term Investments	27,283	32,724
U.S. treasury bonds [Member]
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	0	0
Short-Term Investments	5,662	6,513
Corporate bonds [Member]
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	0	0
Short-Term Investments	4,340	3,481
Cash [Member]
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	210,872	196,863
Short-Term Investments	0	0
Money market funds [Member]
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	16,035	10,173
Short-Term Investments	$ 0	$ 0

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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Glossary Cash
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-Publisher FASB
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-Section 45
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-Glossary Cash Equivalents
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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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-Subparagraph (SX 210.5-02(2))
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