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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	Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2011
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	$ 263,082	$ 198,818	$ 301,792	$ 161,095
Short-term Investments	20,186us-gaap_ShortTermInvestments	32,622us-gaap_ShortTermInvestments
Long-term Investments	0us-gaap_LongTermInvestments	24,761us-gaap_LongTermInvestments
State And Municipal Bond Obligations [Member]
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	0	0
Short-term Investments	20,186	31,102
Long-term Investments	0	0
Auction Rate Securities - Municipal Bonds [Member]
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	0	0
Short-term Investments	0	1,520
Long-term Investments	0	21,933
Auction Rate Securities - Student Loans [Member]
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	0	0
Short-term Investments	0	0
Long-term Investments	0	2,828
Cash [Member]
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	195,189	144,305
Short-term Investments	0	0
Long-term Investments	0	0
Money Market Funds [Member]
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	67,893	54,513
Short-term Investments	0	0
Long-term Investments	$ 0	$ 0

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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