Cash, Cash Equivalents and Investments (Summary of Cash, Cash Equivalents and Trading and Available-For-Sale Investments) (Details) - USD ($) $ in Thousands	Nov. 30, 2019	Nov. 30, 2018
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	$ 154,259	$ 105,126	[1]
Unrealized Gains	23	0
Unrealized Losses	0	(210)
Cash, cash equivalents and investments cost basis	173,662	139,723
Cash, cash equivalents and investments at fair value	173,685	139,513
State and municipal bond obligations
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	7,036	19,542
Unrealized Gains	1	0
Unrealized Losses	0	(119)
Fair Value	7,037	19,423
U.S. treasury bonds
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	7,221	6,726
Unrealized Gains	10	0
Unrealized Losses	0	(21)
Fair Value	7,231	6,705
Corporate bonds
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	5,146	8,329
Unrealized Gains	12	0
Unrealized Losses	0	(70)
Fair Value	5,158	8,259
Cash
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	144,346	101,316
Money market funds
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash 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.