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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	Feb. 28, 2015	Nov. 30, 2014	Feb. 28, 2014	Nov. 30, 2013
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	$ 187,035	$ 263,082	$ 219,356	$ 198,818
Short-Term Investments	24,129us-gaap_ShortTermInvestments	20,186us-gaap_ShortTermInvestments
State and municipal bond obligations [Member]
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	24,129	20,186
Cash [Member]
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	144,157	195,189
Money market funds [Member]
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	$ 42,878	$ 67,893

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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