Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Available-for-sale Investments by Balance Sheet Classification) (Details) - USD ($) $ in Thousands	Aug. 31, 2019	Nov. 30, 2018
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	$ 124,020	$ 105,126	[1]
Short-Term Investments	21,377	34,387	[1]
State and municipal bond obligations
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	8,303	19,423
U.S. treasury bonds
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	6,881	6,705
Corporate bonds
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	6,193	8,259
Cash
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	116,146	101,316
Money market funds
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	$ 7,874	$ 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 Basis of Presentation for further information.