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, 2021	Nov. 30, 2020
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	$ 155,406	$ 97,990
Short-Term Investments	1,967	8,005
U.S. treasury bonds
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	757	5,051
Corporate bonds
Cash, Cash Equivalents and Investments [Line Items]
Short-Term Investments	1,210	2,954
Cash
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	130,371	79,026
Money market funds
Cash, Cash Equivalents and Investments [Line Items]
Cash and Equivalents	$ 25,035	$ 18,964