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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, 2020	Nov. 30, 2019
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	$ 97,990	$ 154,259
Unrealized Gains	99	23
Unrealized Losses	0	0
Cash, cash equivalents and investments cost basis	105,896	173,662
Cash, cash equivalents and investments at fair value	105,995	173,685
State and municipal bond obligations
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis		7,036
Unrealized Gains		1
Unrealized Losses		0
Fair Value		7,037
U.S. treasury bonds
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	4,993	7,221
Unrealized Gains	58	10
Unrealized Losses	0	0
Fair Value	5,051	7,231
Corporate bonds
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	2,913	5,146
Unrealized Gains	41	12
Unrealized Losses	0	0
Fair Value	2,954	5,158
Cash
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	79,026	144,346
Money market funds
Cash, Cash Equivalents and Investments [Line Items]
Cash and cash equivalents	$ 18,964	$ 9,913

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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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Amount, before tax, of unrealized loss 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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