Cash, Cash Equivalents and Investments (Summary Of Cash, Cash Equivalents And Trading And Available-For-Sale Investments) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Nov. 30, 2014	Nov. 30, 2013
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	$ 283,182	$ 260,406
Realized Losses	0	(380)
Unrealized Gains	86	164
Unrealized Losses	0	(3,989)
Fair Value	283,268	256,201
State And Municipal Bond Obligations [Member]
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	20,100	30,938
Realized Losses	0	0
Unrealized Gains	86	164
Unrealized Losses	0	0
Fair Value	20,186	31,102
Auction Rate Securities - Municipal Bonds [Member]
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis		27,150
Realized Losses		(380)
Unrealized Gains		0
Unrealized Losses		(3,317)
Fair Value		23,453
Auction Rate Securities - Student Loans [Member]
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis		3,500
Realized Losses		0
Unrealized Gains		0
Unrealized Losses		(672)
Fair Value		2,828
Cash [Member]
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	195,189	144,305
Fair Value	195,189	144,305
Money Market Funds [Member]
Cash, Cash Equivalents and Investments [Line Items]
Amortized Cost Basis	67,893	54,513
Fair Value	$ 67,893	$ 54,513

Cash Cash Equivalents and Investments at Fair Value

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- Definition

Cash, Cash Equivalents, And Investments, Cost Basis.

+ References

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- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

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- Definition

This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

-Subparagraph (a)

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