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Cash, Cash Equivalents and Investments (Summary Of Cash, Cash Equivalents And Available-For-Sale Investments) (Details) - USD ($) $ in Thousands | Aug. 31, 2017 | Nov. 30, 2016
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Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | $ 191,289 | $ 249,894
Unrealized Gains | 45 | 0
Unrealized Losses | (18) | (140)
Fair Value | 191,316 | 249,754
State and municipal bond obligations [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 37,690 | 32,831
Unrealized Gains | 45 | 0
Unrealized Losses | 0 | (107)
Fair Value | 37,735 | 32,724
U.S. treasury bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 3,523 | 6,542
Unrealized Gains | 0 | 0
Unrealized Losses | (17) | (29)
Fair Value | 3,506 | 6,513
Corporate bonds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 6,319 | 3,485
Unrealized Gains | 0 | 0
Unrealized Losses | (1) | (4)
Fair Value | 6,318 | 3,481
Cash [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 137,911 | 196,863
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 137,911 | 196,863
Money market funds [Member] |  |
Cash, Cash Equivalents and Investments [Line Items] |  |
Amortized Cost Basis | 5,846 | 10,173
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | $ 5,846 | $ 10,173

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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=73527792&loc=d3e27161-111563 + Details
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