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Cash, Cash Equivalents and Investments (Summary Of Cash, Cash Equivalents And Trading And Available-For-Sale Investments) (Details) - USD ($) $ in Thousands	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2016	Nov. 30, 2015
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	$ 105,126	$ 133,464	$ 207,036	$ 212,379
Unrealized Gains	0	0
Unrealized Losses	(210)	(293)
Cash Cash Equivalents And Investments Cost Basis	139,723	183,902
Cash Cash Equivalents And Investments At Fair Value	139,513	183,609
State and municipal bond obligations
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	19,542	40,458
Unrealized Gains	0	0
Unrealized Losses	(119)	(231)
Fair Value	19,423	40,227
U.S. treasury bonds
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	6,726	3,517
Unrealized Gains	0	0
Unrealized Losses	(21)	(26)
Fair Value	6,705	3,491
Corporate bonds
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	8,329	6,463
Unrealized Gains	0	0
Unrealized Losses	(70)	(36)
Fair Value	8,259	6,427
Cash
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	101,316	130,547
Money market funds
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	$ 3,810	$ 2,917

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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