Cash, Cash Equivalents and Investments (Summary Of Cash, Cash Equivalents And Trading And Available-For-Sale Investments) (Details) - USD ($) $ in Thousands	May 31, 2018	Nov. 30, 2017
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	$ 144,482	$ 183,902
Unrealized Gains	0	0
Unrealized Losses	(282)	(293)
Fair Value	144,200	183,609
State and municipal bond obligations
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	32,323	40,458
Unrealized Gains	0	0
Unrealized Losses	(184)	(231)
Fair value of financial assets	32,139
Fair Value		40,227
U.S. treasury bonds
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	6,704	3,517
Unrealized Gains	0	0
Unrealized Losses	(28)	(26)
Fair value of financial assets	6,676
Fair Value		3,491
Corporate bonds
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	8,334	6,463
Unrealized Gains	0	0
Unrealized Losses	(70)	(36)
Fair value of financial assets	8,264
Fair Value		6,427
Cash
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	96,523	130,547
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	96,523	130,547
Money market funds
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	598	2,917
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair value of financial assets	$ 598
Fair Value		$ 2,917

Cash Cash Equivalents and Investments at Fair Value

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Cash, Cash Equivalents, And Investments, Cost Basis.

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Cash Cash Equivalents And Investments [Line Items]

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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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).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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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).

+ References

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