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, 2019	Nov. 30, 2018
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	$ 154,259	$ 105,126	[1]
Short-Term Investments	19,426	34,387	[1]
State and municipal bond obligations
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	7,037	19,423
U.S. treasury bonds
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	7,231	6,705
Corporate bonds
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	5,158	8,259
Cash
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	144,346	101,316
Money market funds
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	$ 9,913	$ 3,810

[1] The Company adopted the accounting standard related to revenue recognition ("ASC 606") effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Summary of Significant Accounting Policies for further information.