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, 2019	Nov. 30, 2018		Feb. 28, 2017	[2]	Nov. 30, 2016	[2]
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	$ 106,516	$ 105,126	[1]	$ 117,111		$ 133,464
Short-Term Investments	26,942	34,387	[1]
State and municipal bond obligations
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	14,348	19,423
U.S. treasury bonds
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	4,379	6,705
Corporate bonds
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	8,215	8,259
Cash
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	94,904	101,316
Money market funds
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	$ 11,612	$ 3,810

[1] The Company adopted ASC 606 effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Basis of Presentation for further information.

[2] The Company adopted ASC 606 effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Basis of Presentation for further information. February 28, 2019February 28, 2018Income tax refunds166307